i toke once every couple months. i've gotta be in the right mood to get high, it just depends on the atmosphere. if it's a fun party with lots of people(girls), no thanks. if its just a mellow night with a couple of guy friends and an xbox, possibly. last time i smoked was november, last time before that was like july; i follow the theory that if it's done in moderation it's really not that bad for you(which i realize only applies to certain things/situations). smoking 3 or 4 times a year isn't going to give you cancer, rot your brain and burn holes in your lungs. its certainly worse than not smoking, but i figure in the long run, doing it that rarely really won't have a monumental impact on my lifespan(i don't smoke cigs either). i work out just about every day, do cardio and muay thai, so i figure it counterbalances the occasional toke.
i like to drink though, but i've got a great tolerance and i know when to stop, so i never end up hunched over a toilet bowl, or blacked out with 0 knowledge of what/who i did last night. too many people drink like they've got something to prove.