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Those "burnouts" we all have run into ate pot's equivalent to an alcoholic. Less dramatic, no deaths, but the equivalent. About 9% of people who get high become dependent, About 16% of kids. Those numbers mirror the percentages of alcohol users who become alcoholics. I have worked with kids for 35 years who went from outstanding student/athletes to "burnouts" failing at school, and dropping every interest they previously had, struggling with their family. I know. You smoked your ass off and none of this happened to you. It's like saying I drank a lot and didn't have a problem therefore people having a problem is BS. But you probably know a person or two that had "amotivational" syndrome and dropped out of school or still live in their parent's house. Again, 91% don't have a problem.
The reality of addiction is that, a person susceptible to alcohol/marijuana/etc dependence will likely become addicted to something no matter what. If it's not pot, it'll be some other substance or activity (gambling). Given the
relative benignity of marijuana, you could view it as: good thing it's pot and not something else.
And just because a small percentage of people do not handle marijuana well, that is no reason to not legalize it. If you treat all things in this manner, no substance on earth would be legal.
The levels of alcohol dependence are more than double that of marijuana dependence (
Scientific American). And that 91% (of people who don't have a dependence problem with regard to M) is astronomically high. You won't find too many 'stimulant' substances that match that percentage.
The burnouts are definitely not the equivalent of long term alcoholics. The ravages on the body of alcohol are far more debilitating (and costly) in long term cases on average. Also, rates of violence (and the associated family discord) involving alcohol are far worse than those associated with marijuana.
Not saying some don't have problems with marijuana, but looking at the numbers, it's probably the least problematic of anything out there. Heck, sugar is probably worse for you, and more addicting, than marijuana (I have no evidence of this, just harboring a guess--I'm too lazy to do the research).
EDIT: Also, those hospital admission stats are often skewed because of legal requirements, not necessarily actual issues with the substance. And, only 1.1% of marijuana users 12 and older in 2011 went to treatment for it nationally.
http://www.drugpolicy.org/drug-facts/10-facts-about-marijuana/sources#treatment