At one point I tried it in high school, but have stayed away since then. No real urge exists for me to try it again, besides I need to save/earn more money not acquire another costly (and illegal) habit.
Back in the day it what everyone did in my home town. Then I went to uni and found that all my new friends prefered to abuse alcohol instead, and being a student I couldn't afford to smoke, so just grew out of it. From what I've heard the strength has really increased recently, and as it's illegal you've always to got to hang out with a bad crowd to get some. I also wonder what the long term effects of "constant use" really are. In summary each to their own, but those over 25 will have a different opinion to the risks.