Your 15 eh. Good on ya for not just 'jumping in' to pot without doing a little research. I was 16 and did the 'NO' bit when I had the first chance. Then went to the library and researched and figured out for myself that it was safe and the government was lying to me. While it's true that MJ isn't as dangerous as smoking cigs, you are young and hafe a lifetime ahead of you. Consider a vaporizer at some point for harm-reduction. Just don't let the amotivational syndrome sneak up on you