Meth is a helluva drug. I've had friends that were into it and then quit and almost every one of them fell back into it at one point or another. I mean I've seen people quit for years and still go back.
Luckily, the only thing I've every really dealt with is cigarettes but after 8 years of smoking I quit, and after 4 years I have ZERO desire to go back.
I do smoke lots of pot, and drink (but I've stopped drinking daily and now only drink maybe once a week if that)
I would venture to say that I am addicted to TV/movies too though... and probably to unhealthy foods...