100 pure tobacco cigarettes "Natural" American Spirit are not a safer choice American Spirits Cigarettes - Juicefly

Standard Butane Lighters Standard butane lighters, which are commonly found in convenience stores, typically produce a flame that reaches temperatures between 1,970F (1,077C) and 1,995F (1,090C)

Aliment Pharmacol Ther 14 (11): 1429-1434

Another layer here is that smoking affects testosterone levels indirectly by stressing out your adrenal glands, which are responsible for managing your bodys hormone response

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This appears to be the broadest of exclusions because it excludes any and all health hazards associated with e-cigarettes