hate to be a thread digger, but I've been on GH for a while now which as you know can raise Prolactin levels. I've been smoking pot daily for over a decade, and it's 100% positive that when I get high my nips start to get a bit more tender, within a few minutes of smoking. Thankfully I have my caber on hand so stay balanced, but I don't care what anyone else says, there is a link. Weed on it's own probably won't do it, because I haven't had any problems until GH was tossed in too, but they don't get tender on GH alone.
I'm sure a ton of people will say I'm full of shit, but I don't care what studies you pull up, this study was done by me, I'm living proof of it. 10 years of using the stuff I know what I'm talking about.