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To eliminate smoking, cigarettes have to lose their coolness and be seen as what they are: a disaster

Ignoring that this paper was specifically about psychosis, not serious mental disorders more generally, perhaps in certain high risk populations the impact of cannabis could be this high, for example in those with a genetic predisposition to psychosis, but its a big leap to conclude that from one study

It is removed primarily through the kidneys

Symptoms of withdrawal include: Intense cravings for the drug Fatigue and sleep disturbances Increased appetite Depression and anxiety These symptoms make quitting difficult without support