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So, I went to Yale and spent my first three years in the Psych Department and then I wrote my thesis

Hormone Type Smokers (Serum Levels) Non-Smokers Total Testosterone Normal Normal DHEA Increased DHEAS Increased Androstenedione Increased Estradiol Increased Despite the increased levels of certain hormones, the overall fertility and spermatogenesis processes appear to be somewhat resistant to the detrimental effects of tobacco smoke, although the evidence indicates impaired reproductive functions among smokers [6]

Loose tobacco above 125g triggers the same 38.5% duty band as cigarettes

however, the nicotine content, if too much for a novice smoker, can completely ruin the experience

A prospective study selects a population in good health and meeting any other desired criteria (smoking habits in this case) and follows it over a period of years to see what happens to its members