Hey Bud,
So I understand you're concerned about the connection, which I had been in the past as well. I started to develop puffy nipples around 11 or 12 and became a chronic smoker by the time I was about 15 or 16.
We know that there are faint connections between alcohol, marijuana, steroids, etc. The reason being because they happen to temporarily raise the estrogen levels in our body (which inevitably, after prolonged chronic usage, may or may not produce the gland or "disc" you're talking about that then produces the puffy nipple). This connection is thought to be true because gynecomastia is in many cases caused by a raised estrogen level in the body therefore leading to the development of breasts. While my brief description of the effect may seem detailed, I am not an expert, however, I have done plenty of research and this does seem to be the case.
After discontinuing my chronic usage before my surgery and maintaining a great diet and exercise, I noticed my puffy nipples started to unswell just a tad (not fully of course, but it helped). Don't get me wrong, I am not bad mouthing pot in any way, I do love the stuff, but unfortunately it is a habit that does leave toxins in your body, tar in your lungs, and if you're smoking it everyday - may lead to this condition.
From what I have heard, if you have had the gland for over one or two years, the only true solution is surgery to return your nipples to a "normal" look. However, like I said, changing your diet, exercise, and ceasing the habit may bring down the puffiness somewhat and help if you can't afford the surgery.
Post surgery I have smoked it a few times, likewise, I've had a glass of wine here and there, beer on occasion, hell, I've still done the usual young-adult-still-in-university party night sort of drinking (once or twice). The truth is, I believe it is all about moderation. It is difficult to tell someone of your age that you'll never be able to touch a drop of alcohol just because it MAY cause gynecomastia. The same I believe goes for your little habit. Cut back on it; if you're doing it everyday, you really even lose sight of why you started smoking it in the first place
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While some may disagree with my opinion, I prefer if those who are in complete and utter disagreeance without having done their proper research not respond to this post.
Hope this helps guy!