I started this past fall. (I'm 17). I don't recommend for anyone under 18 to start smoking. I had a lot of potential in school. I have/had very smart relatives, and my family, in general, is smart. But i started smoking pot, and eventually i was smoking on school nights instead of studying. It fucked up my life, and now i'm looking at going to a community college after i graduate. That's a first hand experience. Now of course not everyone fucks up in school becasue of pot. But if you start smoking instead of doing your work, you're fucked. Peace.