I used to smoke a lot in my 20's and early 30's, and would pretty much always play WC2 with my hands alternating between mouse, keyboard and bong - even mid-game lol.
I'm 48 now and I haven't had more than a very occasional social puff on someone else's joint in about 15 years. I just dont really enjoy it very much any more.
IMO it's pretty harmless stuff. The biggest negative is it makes you feel happy being bored and doing nothing very much. It's easy to turn around and suddenly realise you haven't actually done anything with 10 years of your life apart from get stoned. Bit of a waste when you think about it.
its impossible to od on it
challenge accepted
LOL nice. Suggest using the time to do less re-tweeting and more actual reading