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Smoking appears to increase testosterone levels :

"Smoking men had 15% higher total and 13% higher free testosterone levels compared with men who never smoked. Thus, smoking seems to be an important confounding factor when evaluating testosterone levels, and could possibly mask borderline hypogonadism."

http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2605.2006.00720.x/abstract

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