Mostly personal experience :) I have stopped drinking alcohol for a year, coffee a couple times for few weeks at a time, and sugar for couple days at most. Neve

Mostly personal experience :) I have stopped drinking alcohol for a year, coffee a couple times for few weeks at a time, and sugar for couple days at most. Never tried smoking though. IMO drinking both coffee and alcohol casually leads more easily to a coffee addiction, but without you noticing.