Dr. Peter Grinspoon
@grinspoon.bsky.social
Primary Care Doc. & #cannabis specialist Harvard Med.
Substack: https://drpetergrinspoon.substack.com
Books: Free Refills, Seeing Through the Smoke, Aging Well with Cannabis and CBD
Substack: https://drpetergrinspoon.substack.com
Books: Free Refills, Seeing Through the Smoke, Aging Well with Cannabis and CBD
Pinned
Big Cannabis just funneled millions to Trump
Undermining the social justice movement that legalized cannabis
drpetergrinspoon.substack.com
New blog:
In what universe does it make sense for Big Cannabis to bankroll Trump? When corporate cannabis aligns with anti-democratic power, it betrays the patients and activists who fought for legalization. We need legalization without corruption.
drpetergrinspoon.substack.com/p/big-cannab...
In what universe does it make sense for Big Cannabis to bankroll Trump? When corporate cannabis aligns with anti-democratic power, it betrays the patients and activists who fought for legalization. We need legalization without corruption.
drpetergrinspoon.substack.com/p/big-cannab...
Check out one of my most popular video on the myriad uses of #cannabis in seniors
(I have book coming out on this topic on 5/5/26)
www.youtube.com/watch?v=jGJy...
(I have book coming out on this topic on 5/5/26)
www.youtube.com/watch?v=jGJy...
Cannabis EXPERT Shares Surprising Benefits for Seniors
YouTube video by Peter Grinspoon
www.youtube.com
February 4, 2026 at 1:15 PM
Check out one of my most popular video on the myriad uses of #cannabis in seniors
(I have book coming out on this topic on 5/5/26)
www.youtube.com/watch?v=jGJy...
(I have book coming out on this topic on 5/5/26)
www.youtube.com/watch?v=jGJy...
Reposted by Dr. Peter Grinspoon
New blog:
In what universe does it make sense for Big Cannabis to bankroll Trump? When corporate cannabis aligns with anti-democratic power, it betrays the patients and activists who fought for legalization. We need legalization without corruption.
drpetergrinspoon.substack.com/p/big-cannab...
In what universe does it make sense for Big Cannabis to bankroll Trump? When corporate cannabis aligns with anti-democratic power, it betrays the patients and activists who fought for legalization. We need legalization without corruption.
drpetergrinspoon.substack.com/p/big-cannab...
Big Cannabis just funneled millions to Trump
Undermining the social justice movement that legalized cannabis
drpetergrinspoon.substack.com
January 27, 2026 at 4:34 PM
New blog:
In what universe does it make sense for Big Cannabis to bankroll Trump? When corporate cannabis aligns with anti-democratic power, it betrays the patients and activists who fought for legalization. We need legalization without corruption.
drpetergrinspoon.substack.com/p/big-cannab...
In what universe does it make sense for Big Cannabis to bankroll Trump? When corporate cannabis aligns with anti-democratic power, it betrays the patients and activists who fought for legalization. We need legalization without corruption.
drpetergrinspoon.substack.com/p/big-cannab...
'Findings suggest cannabis beverages may support alcohol substitution and reduce alcohol-related harms, offering a promising alternative for individuals seeking to lower alcohol intake.'
#cannabis #harmreduction
www.tandfonline.com/doi/full/10....
#cannabis #harmreduction
www.tandfonline.com/doi/full/10....
The Exploration of Cannabis Beverage Substitution for Alcohol: A Novel Harm Reduction Strategy
Alcohol consumption is associated with nearly 200 health conditions. As cannabis-infused beverages emerge in the legal market, their potential as a substitute for alcohol is of growing interest. Th...
www.tandfonline.com
February 2, 2026 at 2:26 PM
'Findings suggest cannabis beverages may support alcohol substitution and reduce alcohol-related harms, offering a promising alternative for individuals seeking to lower alcohol intake.'
#cannabis #harmreduction
www.tandfonline.com/doi/full/10....
#cannabis #harmreduction
www.tandfonline.com/doi/full/10....
Important article about upcoming elections:
www.nytimes.com/2026/01/31/o...
www.nytimes.com/2026/01/31/o...
Opinion | Trump Could Interfere With the Midterm Elections. You Can Help Defend Them.
www.nytimes.com
January 31, 2026 at 11:00 PM
Important article about upcoming elections:
www.nytimes.com/2026/01/31/o...
www.nytimes.com/2026/01/31/o...
Another study suggesting that people are substituting #cannabis for #alcohol, which is a critical way to accomplish harm reduction.
www.tandfonline.com/doi/abs/10.1...
www.tandfonline.com/doi/abs/10.1...
The Exploration of Cannabis Beverage Substitution for Alcohol: A Novel Harm Reduction Strategy
Alcohol consumption is associated with nearly 200 health conditions. As cannabis-infused beverages emerge in the legal market, their potential as a substitute for alcohol is of growing interest. Th...
www.tandfonline.com
January 28, 2026 at 7:11 PM
Another study suggesting that people are substituting #cannabis for #alcohol, which is a critical way to accomplish harm reduction.
www.tandfonline.com/doi/abs/10.1...
www.tandfonline.com/doi/abs/10.1...
Honored to be included in this interesting Guardian article -- the world is changing! (for the better); though: use #cannabis with caution (and not with alcohol...)
www.theguardian.com/us-news/2026...
www.theguardian.com/us-news/2026...
Chicago’s United Center to offer cannabis drinks – could other arenas follow?
Drinks to be sold at concerts under federal legislation but attenders may have to wait to imbibe at sporting events
www.theguardian.com
January 28, 2026 at 4:26 PM
Honored to be included in this interesting Guardian article -- the world is changing! (for the better); though: use #cannabis with caution (and not with alcohol...)
www.theguardian.com/us-news/2026...
www.theguardian.com/us-news/2026...
New blog:
In what universe does it make sense for Big Cannabis to bankroll Trump? When corporate cannabis aligns with anti-democratic power, it betrays the patients and activists who fought for legalization. We need legalization without corruption.
drpetergrinspoon.substack.com/p/big-cannab...
In what universe does it make sense for Big Cannabis to bankroll Trump? When corporate cannabis aligns with anti-democratic power, it betrays the patients and activists who fought for legalization. We need legalization without corruption.
drpetergrinspoon.substack.com/p/big-cannab...
Big Cannabis just funneled millions to Trump
Undermining the social justice movement that legalized cannabis
drpetergrinspoon.substack.com
January 27, 2026 at 4:34 PM
New blog:
In what universe does it make sense for Big Cannabis to bankroll Trump? When corporate cannabis aligns with anti-democratic power, it betrays the patients and activists who fought for legalization. We need legalization without corruption.
drpetergrinspoon.substack.com/p/big-cannab...
In what universe does it make sense for Big Cannabis to bankroll Trump? When corporate cannabis aligns with anti-democratic power, it betrays the patients and activists who fought for legalization. We need legalization without corruption.
drpetergrinspoon.substack.com/p/big-cannab...
Off topic for me -- but we all need to push back against ICE, Trump's version of the Gestapo, which is harming (and now murdering) innocent civilians/peaceful protesters; most of the immigrants peaceful too - Trump is destroying fabic of our democracy.
www.pbs.org/newshour/nat...
www.pbs.org/newshour/nat...
Man shot and killed by federal officers in Minnesota was an ICU nurse, his parents say
The man who was shot and killed by a federal officer during an immigration operation has been identified as 37-year-old Alex Pretti, an intensive care unit nurse.
www.pbs.org
January 26, 2026 at 1:32 PM
Off topic for me -- but we all need to push back against ICE, Trump's version of the Gestapo, which is harming (and now murdering) innocent civilians/peaceful protesters; most of the immigrants peaceful too - Trump is destroying fabic of our democracy.
www.pbs.org/newshour/nat...
www.pbs.org/newshour/nat...
As long as people are careful not to consume too much THC, and don't plan on driving, #cannabis drinks are significantly safer than alcohol (which was associated with 178,000 deaths last year); this is harm reduction.
www.nytimes.com/2026/01/25/b...
www.nytimes.com/2026/01/25/b...
High January Is the New Dry January
www.nytimes.com
January 25, 2026 at 2:23 PM
As long as people are careful not to consume too much THC, and don't plan on driving, #cannabis drinks are significantly safer than alcohol (which was associated with 178,000 deaths last year); this is harm reduction.
www.nytimes.com/2026/01/25/b...
www.nytimes.com/2026/01/25/b...
Reposted by Dr. Peter Grinspoon
The nature of today’s unregulated drug supply has changed dramatically. In this video, I explain the risks of pressed pills and fentanyl contamination, and discuss what this means for harm reduction and drug policy.
Watch the full video here: lnkd.in/eXQ6cNbR
Watch the full video here: lnkd.in/eXQ6cNbR
January 19, 2026 at 4:18 PM
The nature of today’s unregulated drug supply has changed dramatically. In this video, I explain the risks of pressed pills and fentanyl contamination, and discuss what this means for harm reduction and drug policy.
Watch the full video here: lnkd.in/eXQ6cNbR
Watch the full video here: lnkd.in/eXQ6cNbR
Excited to speak on Feb. 9th. at 12:30, with wonderful panel, at The Petrie-Flom Center for Health Law Policy, Biotechnology, and Bioethics at Harvard Law School on #cannabis policy! (and I'm at MIT addiction bootcamp today).
petrieflom.law.harvard.edu/events/detai...
petrieflom.law.harvard.edu/events/detai...
January 22, 2026 at 3:43 PM
Excited to speak on Feb. 9th. at 12:30, with wonderful panel, at The Petrie-Flom Center for Health Law Policy, Biotechnology, and Bioethics at Harvard Law School on #cannabis policy! (and I'm at MIT addiction bootcamp today).
petrieflom.law.harvard.edu/events/detai...
petrieflom.law.harvard.edu/events/detai...
Shocking!
'US drug policy does not align with experts’ rankings of drug harms: a multi-criteria decision analysis'
#cannabis was in the middle and mushrooms were the least dangerous...has no relationship to how these substances are scheduled in CSA.
link.springer.com/article/10.1...
'US drug policy does not align with experts’ rankings of drug harms: a multi-criteria decision analysis'
#cannabis was in the middle and mushrooms were the least dangerous...has no relationship to how these substances are scheduled in CSA.
link.springer.com/article/10.1...
US drug policy does not align with experts’ rankings of drug harms: a multi-criteria decision analysis - Harm Reduction Journal
Background United States drug policy is primarily based on the Controlled Substances Act of 1970 and largely contradicts scientific evidence about how to mitigate drugs’ harms. Expert consensus on dru...
link.springer.com
January 19, 2026 at 5:08 PM
Shocking!
'US drug policy does not align with experts’ rankings of drug harms: a multi-criteria decision analysis'
#cannabis was in the middle and mushrooms were the least dangerous...has no relationship to how these substances are scheduled in CSA.
link.springer.com/article/10.1...
'US drug policy does not align with experts’ rankings of drug harms: a multi-criteria decision analysis'
#cannabis was in the middle and mushrooms were the least dangerous...has no relationship to how these substances are scheduled in CSA.
link.springer.com/article/10.1...
'Acute migraine treatment with 6% THC + 11% CBD was superior to placebo at 2-h post-treatment with sustained benefits at 24 and 48 h.'
(ramdomized, double-blind, placebo controlled)
#cannabis #migraine
pubmed.ncbi.nlm.nih.gov/41469488/
(ramdomized, double-blind, placebo controlled)
#cannabis #migraine
pubmed.ncbi.nlm.nih.gov/41469488/
Vaporized cannabis versus placebo for acute migraine: A randomized, double-blind, placebo-controlled crossover trial - PubMed
Acute migraine treatment with 6% THC + 11% CBD was superior to placebo at 2-h post-treatment with sustained benefits at 24 and 48 h.
pubmed.ncbi.nlm.nih.gov
January 19, 2026 at 4:58 PM
'Acute migraine treatment with 6% THC + 11% CBD was superior to placebo at 2-h post-treatment with sustained benefits at 24 and 48 h.'
(ramdomized, double-blind, placebo controlled)
#cannabis #migraine
pubmed.ncbi.nlm.nih.gov/41469488/
(ramdomized, double-blind, placebo controlled)
#cannabis #migraine
pubmed.ncbi.nlm.nih.gov/41469488/
The nature of today’s unregulated drug supply has changed dramatically. In this video, I explain the risks of pressed pills and fentanyl contamination, and discuss what this means for harm reduction and drug policy.
Watch the full video here: lnkd.in/eXQ6cNbR
Watch the full video here: lnkd.in/eXQ6cNbR
January 19, 2026 at 4:18 PM
The nature of today’s unregulated drug supply has changed dramatically. In this video, I explain the risks of pressed pills and fentanyl contamination, and discuss what this means for harm reduction and drug policy.
Watch the full video here: lnkd.in/eXQ6cNbR
Watch the full video here: lnkd.in/eXQ6cNbR
Reposted by Dr. Peter Grinspoon
Before I was a doctor, I was a kid watching my older brother Danny endure chemo for leukemia. Cannabis was the only thing that stopped the nausea & vomiting before he died at 16. It was the '70s, and using it meant breaking the law. Watch the full video at youtu.be/-MWHVhlIHwk
A Brother's Battle with Leukemia and What Cannabis Did
YouTube video by Peter Grinspoon
youtube.com
January 10, 2026 at 6:10 PM
Before I was a doctor, I was a kid watching my older brother Danny endure chemo for leukemia. Cannabis was the only thing that stopped the nausea & vomiting before he died at 16. It was the '70s, and using it meant breaking the law. Watch the full video at youtu.be/-MWHVhlIHwk
Interesting results:
'Older Adults’ Perspectives on and Experiences with Cannabis Use: Results From the 2024 National Poll on Healthy Aging'
(this is what my upcoming book is about, #cannabis use in seniors, how to use it safely...)
pmc.ncbi.nlm.nih.gov/articles/PMC...
'Older Adults’ Perspectives on and Experiences with Cannabis Use: Results From the 2024 National Poll on Healthy Aging'
(this is what my upcoming book is about, #cannabis use in seniors, how to use it safely...)
pmc.ncbi.nlm.nih.gov/articles/PMC...
Older Adults’ Perspectives on and Experiences with Cannabis Use: Results From the 2024 National Poll on Healthy Aging
Cannabis use is increasing among older adults, concurrent with regulations allowing medical and/or recreational consumption, increases in the THC potency of cannabis products, and declining public perceptions of cannabis-related risks. Using a ...
pmc.ncbi.nlm.nih.gov
January 19, 2026 at 4:15 PM
Interesting results:
'Older Adults’ Perspectives on and Experiences with Cannabis Use: Results From the 2024 National Poll on Healthy Aging'
(this is what my upcoming book is about, #cannabis use in seniors, how to use it safely...)
pmc.ncbi.nlm.nih.gov/articles/PMC...
'Older Adults’ Perspectives on and Experiences with Cannabis Use: Results From the 2024 National Poll on Healthy Aging'
(this is what my upcoming book is about, #cannabis use in seniors, how to use it safely...)
pmc.ncbi.nlm.nih.gov/articles/PMC...
This is so far beyond acceptable, and needs to stop;
ICE is a fascist army that needs to be dismantled.
'agents have broken hospital protocol, refused to provide documentation and, in some cases, gotten into shouting matches with doctors and nurses.'
www.nytimes.com/2026/01/19/u...
ICE is a fascist army that needs to be dismantled.
'agents have broken hospital protocol, refused to provide documentation and, in some cases, gotten into shouting matches with doctors and nurses.'
www.nytimes.com/2026/01/19/u...
Inside Minnesota Hospitals, ICE Agents Unnerve Staff
www.nytimes.com
January 19, 2026 at 12:03 PM
This is so far beyond acceptable, and needs to stop;
ICE is a fascist army that needs to be dismantled.
'agents have broken hospital protocol, refused to provide documentation and, in some cases, gotten into shouting matches with doctors and nurses.'
www.nytimes.com/2026/01/19/u...
ICE is a fascist army that needs to be dismantled.
'agents have broken hospital protocol, refused to provide documentation and, in some cases, gotten into shouting matches with doctors and nurses.'
www.nytimes.com/2026/01/19/u...
Reposted by Dr. Peter Grinspoon
Please check out my latest blog, informed from my recent work in our low-threshold #addiction clinic at MGH.
'The world has never been so dangerous for drug users -
Pressed Pills and Contaminated Cocaine'
(our drug supply is poisoned with #fentanyl etc.)
drpetergrinspoon.substack.com/p/the-world-...
'The world has never been so dangerous for drug users -
Pressed Pills and Contaminated Cocaine'
(our drug supply is poisoned with #fentanyl etc.)
drpetergrinspoon.substack.com/p/the-world-...
The world has never been so dangerous for drug users
Pressed Pills and Contaminated Cocaine
drpetergrinspoon.substack.com
January 15, 2026 at 4:25 PM
Please check out my latest blog, informed from my recent work in our low-threshold #addiction clinic at MGH.
'The world has never been so dangerous for drug users -
Pressed Pills and Contaminated Cocaine'
(our drug supply is poisoned with #fentanyl etc.)
drpetergrinspoon.substack.com/p/the-world-...
'The world has never been so dangerous for drug users -
Pressed Pills and Contaminated Cocaine'
(our drug supply is poisoned with #fentanyl etc.)
drpetergrinspoon.substack.com/p/the-world-...
As if the fentanyl supply wasn't contaminated enough with xylazine, this new cantaminant, medetomadine causes not so much overdoses but life-threatening withdrawal.
(we need to decriminalize and regulate our drug supply...
#addiction
www.nytimes.com/2025/12/15/h...
(we need to decriminalize and regulate our drug supply...
#addiction
www.nytimes.com/2025/12/15/h...
A Powerful New Drug Is Creating a ‘Withdrawal Crisis’ in Philadelphia
www.nytimes.com
January 17, 2026 at 12:27 PM
As if the fentanyl supply wasn't contaminated enough with xylazine, this new cantaminant, medetomadine causes not so much overdoses but life-threatening withdrawal.
(we need to decriminalize and regulate our drug supply...
#addiction
www.nytimes.com/2025/12/15/h...
(we need to decriminalize and regulate our drug supply...
#addiction
www.nytimes.com/2025/12/15/h...
good article:
'A Perspective on Psychedelics as Treatments for Addictions'
#psychedelics
www.jsad.com/doi/10.15288...
'A Perspective on Psychedelics as Treatments for Addictions'
#psychedelics
www.jsad.com/doi/10.15288...
A Perspective on Psychedelics as Treatments for Addictions: Journal of Studies on Alcohol and Drugs: Vol 85, No 5
Journal of Studies on Alcohol and Drugs, 85(5), 583–588 (2024). http://dx.doi.org/10.15288/jsad.23-00032 -->
www.jsad.com
January 15, 2026 at 9:40 PM
good article:
'A Perspective on Psychedelics as Treatments for Addictions'
#psychedelics
www.jsad.com/doi/10.15288...
'A Perspective on Psychedelics as Treatments for Addictions'
#psychedelics
www.jsad.com/doi/10.15288...
Please check out my latest blog, informed from my recent work in our low-threshold #addiction clinic at MGH.
'The world has never been so dangerous for drug users -
Pressed Pills and Contaminated Cocaine'
(our drug supply is poisoned with #fentanyl etc.)
drpetergrinspoon.substack.com/p/the-world-...
'The world has never been so dangerous for drug users -
Pressed Pills and Contaminated Cocaine'
(our drug supply is poisoned with #fentanyl etc.)
drpetergrinspoon.substack.com/p/the-world-...
The world has never been so dangerous for drug users
Pressed Pills and Contaminated Cocaine
drpetergrinspoon.substack.com
January 15, 2026 at 4:25 PM
Please check out my latest blog, informed from my recent work in our low-threshold #addiction clinic at MGH.
'The world has never been so dangerous for drug users -
Pressed Pills and Contaminated Cocaine'
(our drug supply is poisoned with #fentanyl etc.)
drpetergrinspoon.substack.com/p/the-world-...
'The world has never been so dangerous for drug users -
Pressed Pills and Contaminated Cocaine'
(our drug supply is poisoned with #fentanyl etc.)
drpetergrinspoon.substack.com/p/the-world-...
Reposted by Dr. Peter Grinspoon
HNY!!!! What a zany, wonderful year! Check out my year in review.
#cannabis #psychedelics #addiction
drpetergrinspoon.substack.com/p/what-i-lea...
#cannabis #psychedelics #addiction
drpetergrinspoon.substack.com/p/what-i-lea...
What I Learned in 2025 (So You Don’t Have to)
From cannabis policy to koalas in Australia—lessons worth carrying into 2026
drpetergrinspoon.substack.com
January 1, 2026 at 4:03 PM
HNY!!!! What a zany, wonderful year! Check out my year in review.
#cannabis #psychedelics #addiction
drpetergrinspoon.substack.com/p/what-i-lea...
#cannabis #psychedelics #addiction
drpetergrinspoon.substack.com/p/what-i-lea...
Good news: 'Federal Health Official Says Teens Are Finding It Harder To Access Marijuana Even As Legalization Spreads, Contrary To Opponents’ Fears'
(double standard with #cannabis: if teen rates were rising, this would be front page news...)
www.marijuanamoment.net/federal-heal...
(double standard with #cannabis: if teen rates were rising, this would be front page news...)
www.marijuanamoment.net/federal-heal...
Federal Health Official Says Teens Are Finding It Harder To Access Marijuana Even As Legalization Spreads, Contrary To Opponents' Fears - Marijuana Moment
Youth marijuana use is stable amid the state legalization movement, despite prohibitionist claims to the contrary. Beyond that, more students are actually saying it’s harder to access cannabis and tha...
www.marijuanamoment.net
January 14, 2026 at 12:53 PM
Good news: 'Federal Health Official Says Teens Are Finding It Harder To Access Marijuana Even As Legalization Spreads, Contrary To Opponents’ Fears'
(double standard with #cannabis: if teen rates were rising, this would be front page news...)
www.marijuanamoment.net/federal-heal...
(double standard with #cannabis: if teen rates were rising, this would be front page news...)
www.marijuanamoment.net/federal-heal...
RIP Bob Weir! It was great to meet you when I was working at @Greenpeace (before medical school...) -- thanks for all the great memories!
www.nytimes.com/2026/01/11/a...
www.nytimes.com/2026/01/11/a...
Bob Weir Was the Dead’s Invisible Thread
www.nytimes.com
January 11, 2026 at 6:51 PM
RIP Bob Weir! It was great to meet you when I was working at @Greenpeace (before medical school...) -- thanks for all the great memories!
www.nytimes.com/2026/01/11/a...
www.nytimes.com/2026/01/11/a...
Before I was a doctor, I was a kid watching my older brother Danny endure chemo for leukemia. Cannabis was the only thing that stopped the nausea & vomiting before he died at 16. It was the '70s, and using it meant breaking the law. Watch the full video at youtu.be/-MWHVhlIHwk
A Brother's Battle with Leukemia and What Cannabis Did
YouTube video by Peter Grinspoon
youtube.com
January 10, 2026 at 6:10 PM
Before I was a doctor, I was a kid watching my older brother Danny endure chemo for leukemia. Cannabis was the only thing that stopped the nausea & vomiting before he died at 16. It was the '70s, and using it meant breaking the law. Watch the full video at youtu.be/-MWHVhlIHwk