163. What’s More Dangerous: Marijuana or Alcohol?

Episode Summary

Executive Summary: The episode compares alcohol and marijuana as if both were newly discovered today, arguing that an evidence-based society would likely treat alcohol as the more harmful drug because of its stronger health, crime, and social costs. It explores prohibition, regulation, externalities, legalization, and the possibility of safer alcohol-like alternatives that preserve intoxication without the damage.

Main Topics: Thought experiment: alcohol vs. marijuana from scratch: The hosts imagine a world identical to today except alcohol and marijuana are newly discovered tomorrow, asking how society would judge their risks and regulate them without historical baggage. Economics of externalities and regulation: Steven Levitt frames drug policy around externalities rather than private consumption, arguing society should focus on harms imposed on others and potentially price them through taxes or regulation. Alcohol’s harms relative to marijuana: Experts cite alcohol’s links to disease, addiction, brain damage, violence, drunk driving, and broader social costs, while marijuana is portrayed as comparatively less harmful and less linked to violence. Legalization, data, and illicit-market harms: The episode notes that marijuana’s illegality reduces data quality and creates black-market violence, policing, and prison costs, complicating direct comparisons with alcohol. Prohibition as a policy test: Jeffrey Myron uses U.S. alcohol prohibition to show bans only modestly reduced consumption and produced major unintended violence, making prohibition an imperfect solution. Potential substitution effects from marijuana legalization: Several studies suggest that legal marijuana may substitute for alcohol in some users, possibly lowering traffic fatalities because marijuana appears less impairing for driving than alcohol. Future alternatives: synthetic alcohol and antidotes: David Nutt proposes creating a safer intoxicant plus an antidote pill, aiming to preserve alcohol’s social pleasures without addiction, hangovers, or organ damage.

Key Arguments: An economist would evaluate alcohol and marijuana mainly by their externalities—harms imposed on others—rather than by private use alone. Alcohol likely has larger societal costs than marijuana, even though alcohol is culturally normalized and broadly accepted. Marijuana’s illegality makes harms harder to measure and adds black-market costs such as violence, policing, and incarceration. Alcohol is associated with major health harms, including cancers, heart damage, brain damage, addiction, and shortened lifespan. Alcohol’s social harms include drunk driving, domestic violence, burglary, and homicide-related intoxication. There is little credible evidence that marijuana use itself increases violence, and the gateway-drug theory is weak statistically. Alcohol prohibition reduced use only modestly and caused severe unintended violence, so prohibition is not a clean fix. Legal marijuana may displace alcohol use and reduce traffic deaths because marijuana seems less dangerous for driving. A safer alcohol substitute with an antidote could theoretically preserve pleasure while reducing mortality and disease.

Data Points: Alcohol-related driving deaths in the U.S.: roughly 10,000 per year - Used to illustrate alcohol’s external costs and road-safety impact Share of U.S. traffic deaths: roughly one-third - Alcohol-related driving deaths as a fraction of total traffic fatalities Alcohol-related harm worldwide: over 3 million deaths - David Nutt’s estimate of alcohol shortening life expectancy and accelerating death Global drug rank after tobacco: leading cause of death after tobacco - Positioning alcohol among the most dangerous substances U.S. drug arrests involving marijuana: roughly half - FBI data on marijuana’s prominence in drug arrests Marijuana arrests for possession: 42% - Share of marijuana arrests for possession Marijuana arrests for sale/manufacturing: 6% - Share of marijuana arrests for sale or manufacturing Prohibition’s effect on alcohol use: about 10-30% reduction - Jeffrey Myron’s estimate using cirrhosis as a proxy during U.S. alcohol prohibition Post-repeal alcohol use increase: about 20-25% - Estimated increase after prohibition ended U.S. homicide rate in late 1920s: as high as it’s ever been; 2-3 times higher than now - Cited as a violence spike during alcohol prohibition Alcohol harm score vs. cannabis: cannabis scored less than half of alcohol’s overall harms - From David Nutt’s multi-criteria study of 20 drugs

Pivotal Quotes: "I don't think it, meaning marijuana, is more dangerous than alcohol." — Barack Obama: Referenced as a high-profile view supporting the claim that marijuana may be less harmful than alcohol "What did they find? What would you guess was deemed the most harmful drug overall of these 20 drugs? It turns out that alcohol was the most harmful drug overall" — Narrator / David Nutt study summary: Introduces the study’s conclusion comparing alcohol with other drugs including cannabis "Find a safe alternative, a drug which makes you pleasantly intoxicated, but which does not cause addiction, doesn't rot your brain, your liver, your guts, etc." — David Nutt: Explains his goal of creating a safer replacement for alcohol

Implications: Listeners should see drug policy as a harm-reduction problem, not a morality contest. The episode suggests marijuana legalization may be less risky than alcohol, while future innovation could focus on safer intoxicants and smarter regulation rather than blanket bans.