Is Marijuana Physically Addictive?

I have been having dialog with my brother who thinks anyone who smokes marijuana is just a waste case. And that they could not, nor would not be able to quit. I need some documentation to back up my claim... that while we may "want" to smoke, we don't "need" to smoke. Subtle difference, but... show more I have been having dialog with my brother who thinks anyone who smokes marijuana is just a waste case. And that they could not, nor would not be able to quit. I need some documentation to back up my claim... that while we may "want" to smoke, we don't "need" to smoke. Subtle difference, but I'll take it.
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