Before everyone goes asking : Source?, I want to caution one thing. Smoking increases testosterone levels[0]. Like any drug, nicotine has a variety of side ef

Before everyone goes asking : Source?, I want to caution one thing. Smoking increases testosterone levels[0]. Like any drug, nicotine has a variety of side effects, and one of them seems to be increasing testosterone levels (the exact measures here are complicated, read the article for more info). So, trying to untie the decease in smoking to a total decrease in male testosterone seems to be an active area of research and one that the literature is still working on. Maybe there is a falling amount that is not due to less smoking, maybe there isn't. [0] https://pubmed.ncbi.nlm.nih.gov/17163954/ https://pubmed.ncbi.nlm.nih.gov/17163954/