...Could be yes. I found this on PubMed: Effects of smoking on plasma testosterone level an... [J Sex Med. 2012] - PubMed - NCBI. Unfortunately it's just the abstract, not the full paper but it suggests that in rats at least, regular smoking decreases testosterone levels, smooth muscle and sinusoidal space. The filling rate and pressure of the corpora cavernosum are also reduced.
Whether this has an analogous effect in humans is debatable, but I'll be using it as inspiration in my fight to quit. Hope it helps others who are trying to find the will, as well.

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