If you search on yahoo or google you can find some interesting articles on the effects of marijuana. From what I understand it causes an increase in estro, which in turn makes your muscles softer and puffier. This is no big deal if you bulking, cuz your gonna get plump anyways right? But if your trying to cut for summer I would stay away. Also i recently gave in and smoked on 4-20 just to please some of my friends. This was not good at all, I literally spent the next couple of days on a estrogen spike from hell. I was insecure, cried for no reason, just felt like a bitch. Popped a clomid and it all went away. I'm also on 100mg of fina ed so that probably played a role. Well just thought I'd share my opinion, late.