The pick
Cannabis carries the lower risk of fatal overdose and the lower risk of death from withdrawal. Alcohol carries the higher risk of organ damage, cancer, and death during detox. That ranking covers physical danger. It does not make cannabis safe. NIDA estimates 3 in 10 people who use cannabis have some degree of cannabis use disorder.
Both drugs are psychoactive. Both impair driving. Neither is a health product.
Dependence and addiction rates
About 9 in 100 adults who use cannabis become dependent. The rate is about 17 in 100 for people who start in their teens (NIDA).
Counts from SAMHSA's 2022 National Survey on Drug Use and Health: 29.5 million people in the US had alcohol use disorder in the past year. About 19 million had cannabis use disorder. Against a US population of roughly 335 million, that is about 9 in 100 for alcohol and about 6 in 100 for cannabis.
Cannabis Addiction Withdrawal Symptoms: Timeline and Relief
These are counts of past-year disorder, not counts of users.
Overdose
Alcohol poisoning kills about 2,200 people in the US each year (CDC). A lethal dose of alcohol is easy to reach: roughly 4 to 5 drinks in an hour for a 160 lb adult pushes blood alcohol past 0.30%, the range linked to coma and respiratory arrest.
Cannabis has no confirmed lethal dose in humans. Fatal cannabis overdose is not documented in the medical literature. That fact sits next to a second fact: high doses cause panic, vomiting, and in some cases psychosis. Edible calls to US poison centers rose after state legalization.
Withdrawal
Alcohol withdrawal starts 6 to 24 hours after the last drink. Symptoms include tremor, sweating, raised pulse, and seizures. Delirium tremens is the severe form. It kills.
Cannabis withdrawal starts 1 to 3 days after last use and peaks in week one. Symptoms: irritability, insomnia, poor appetite, cravings, sweating, headache. It does not kill.
Long-term health harm
Alcohol is an IARC Group 1 carcinogen. It raises risk for cancer of the mouth, throat, larynx, esophagus, liver, colon, and breast. It causes cirrhosis, pancreatitis, and cardiomyopathy. CDC attributes about 178,000 US deaths a year to excessive drinking.
Cannabis smoke irritates the airways and is linked to chronic bronchitis. Daily use of high-potency products is linked to anxiety, paranoia, and a higher risk of psychosis in young users. Cannabinoid hyperemesis syndrome causes repeated vomiting and abdominal pain in long-term daily users. Hot showers give short relief.
Driving and injury
Both drugs impair driving. Alcohol cuts lane control and reaction time at low blood levels. Cannabis cuts lane control and tracking. Combining the two raises crash risk more than either alone. A breath test cannot measure cannabis impairment, and THC blood levels do not track impairment.
Lower-risk cannabis options
If the choice lands on cannabis, format and dose change the risk. These are the options, listed from lowest dependence risk to highest.
1. Low-THC flower, under 10% THC
Lower THC per hit means a smaller dose per puff. Users can stop at one or two puffs. Smoke still irritates airways.
2. CBD-dominant products with THC under 1%
Little to no intoxication at these levels. Dependence risk is low. Check the lab label, since hemp-derived products vary.
3. Edibles at 2.5 mg or 5 mg THC per piece
Onset runs 30 to 120 minutes. Peak effect lands at 2 to 3 hours. Total duration is 4 to 6 hours. Wait 2 hours before a second dose. Most edible overdoses trace to a second dose taken too early.
4. Tinctures with a marked dropper
A marked dropper gives a measured dose. Alcohol-based tinctures hold small amounts of ethanol. Oil-based tinctures do not.
Avoid: concentrates at 70% to 90% THC
Dabs, wax, and high-potency vape carts raise tolerance and dose per session. Daily concentrate use is the pattern most linked to cannabis use disorder and to cannabinoid hyperemesis syndrome.
Who should skip both
Anyone under 21. People who are pregnant or breastfeeding. People with a personal or family history of psychosis. People with liver disease and anyone on benzodiazepines or opioids. Cannabis is illegal under US federal law, and state rules differ on possession, home grow, and purchase limits.
Notes on the numbers
Figures above come from the CDC, SAMHSA, NIDA, and IARC. They cover the US. This page is not medical advice. Talk to a clinician about your own use.