The conception of marijuana as a potentially fatal, highly addictive narcotic, on which much of last century’s anti-weed propaganda was built, has been disproved by science, which has shown that it’s almost literally impossible for humans to consume enough THC to overdose. (In fact, dying from drinking too much water would be far easier.)
Speaking of dependence: Pro-pot advocates (as well as the number of people who regularly smoke weed without needing to smoke weed) suggest that marijuana isn't addictive. And, while it's true that the overall addiction potential is less than that of caffeine, our bodies can become dependent, says Dr. Cooper. Is kicking pot a Trainspotting-style withdrawal? Absolutely not, she says — but there are effects. "It's not to the same degree as opiates or alcohol," she explains. "Marijuana withdrawal is subtle. If you're smoking every day and you suddenly stop, there are symptoms — decreased sleep, irritability, decreased calorie intake — that people don't tie to stopping marijuana." That's because, she says, the withdrawal is not an immediate response. The onset of symptoms doesn't begin until the day after a person stops smoking, and it doesn't peak until three or four days later — too late for most people to connect the two.