Men Who Smoke Prone to Impotence
"Don't use ED medications -- Viagra, Cialis -- if you don't need them. Erections that last longer than four hours -- priapism -- can cause permanent scar tissue and permanent impotence. It's not a good idea to use these drugs casually."
If heart disease, stroke and certain cancers haven't been reason enough for men to quit smoking, consider this: The habit also increases the risk of erectile dysfunction. via HON