I usually drink a lot of caffeine for instance (~5 cups of strong coffee a day) but every couple of months I'll quit so my tolerance goes down. I have no trouble quitting, no headaches, no need, nada. I do the same thing with smoking a pipe and a few other drugs. People talk about how hard it is to quite smoking or something and I have no idea what they mean.
I don't mean for this to come off as a brag, but to help define what we're talking about. I know I can build up a physical tolerance. But I don't build up any addiction. I'm not sure if that's something physical or mental. Personally I think its physical.
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