Think the smoking hand gets a lot of Nicotine exposure. That may contaminate clean / clear surfaces ? Door handles, shopping carts, silverware. Poker hands & Craps. That sort of stuff.
It's not a disease. The hand of a smoker is no more a contaminate than your germy hand that's been who knows where. Nicotine is not a poison unless you took a huge dose of it, in fact it can be useful to some brains as a stimulant and a help in focusing. Not only does it not "drive people crazy," it is helpful and soothing to many people with mental illness.
It is the tars in the tobacco that give people cancer, not the nicotine.
It's been 30 years since I've had a cigarette, but it still bothers me when people go overboard about other people smoking. I used to sit in designated smoking sections and have smirking strangers walk over and tell me smoking was bad for me.
I heard a woman at church say, "The only good thing about smokers is they die young." I felt like saying the only good thing about sugar is it gives women like you diabetes.
It's a bad health habit, period. It is not a sin. It can cause cancer, but if someone chooses to do it, in their own home or back porch, then that's their business. Unless you want me to follow you around and tell you to put your seat belt on, don't eat those sweets, watch out for the mercury in that tuna sandwich, floss every night, sit back from the screen, do your exercises, count your calories, watch your protein, don't eat too much iron, put that glass of milk down it's cow mucus! You are so disgusting.