It is actually addictive. Whether or not you go to rehab has nothing to do with lab results. Frequent marijuana use has a 9% addiction rate in adults 21 and over. The rate gets higher as you go lower in age.
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I guess I was wrong. But I do think the number may be a tad inaccurate, just because of how unique each case would be. Also, have you ever heard of the documentary called the union? I think you'd enjoy it, and it's on Netflix.