I don't know anyone who has, but studying the dependency it causes, it can in fact actually cause insanity. The brain rewrites itself based on any experience. Weed is a strong experience so the brain rewrites very quickly and totally around it
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You don't know what you're talking about.
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I've had to quit several times for work. No issues here. I agree weed can be mentally addicting and if quitting causes different personalities then you're weak minded.