I smoke just about daily.......I started when I was 18. Quit for a bit while in the service, but other than that a very regular smoker.
I have never had any gyno or any sides for that matter except laziness and wanting to eat everything!
I am a member of NORML (National Organization for Reformation of Marijuana Laws) and have done much research on the MJ and have NEVER heard of it causing gyno! Now, yes, it can cause some people to have "estrogen" related fat in the stomach area so maybe your nips just have some extra fat?
It's better to burn out, than to fade away...