To me it is not about the smell (it does and it stinks) its not about the butts (smokers are not the only ones whom litter) it is about one thing tobacco smoke is a carcenogen and a strong one. I spent some time with an oncologist last year lending moral support with a friend (non smoker with lung cancer) and the question of how did this happen to me came up. The anser was an anology.
It is like walking blind folded accross a big street, if you go across at 3 am there are is less chance of getting hit against walking across at rush hour. But you can get hit at 3 general health and genetics change things but once is all it takes.
Cancer is caused by radioactive particles ONE can do it. It embeds in tissues and causes cells around it to die, mutate and not reproduce or mutate and reproduce. Mutate and reproduce is called cancer. ONE single radioactive particle. Polonium 210 (radioactive) is in every cigarette there is a higher concentration of this in the second hand smoke. So yes you can get cancer from ONE exposure. The more exposure you have (remember crossing the road) the better your chances become.
1 in 5 die as a direct result of smoking. It is your right to play russian roulette (oh better odds there. 1 in 6) but is it not your right to involve me. I have seen cancer up close and personal, held the hand of a friend while she died. I doesn't seem too much to ask that smokers walk away from entrances and windows of people whom have not decided to smoke you do that is fine, I don't so please don't make me.
http://www.epa.gov/radiation/sources/tobacco.html
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