Nicotine is a substance that you find in tobacco, cigarettes and in cigars. They have a effect on erection power and size. Its not the only cause of ED. There are a lot that it all in the mind or stress related
The nicotine and cotinine in cigarettes inhibits and reduces testosterone production which is associated with ED.
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Smoking can also shorten your penis by as much as a centimeter. Erections are all about good blood flow, and lighting up calcifies blood vessels, stifling erectile circulation.