Smoking, is it a form of suicide?

While I am walking down the park, enjoying the smell of flowers which have not withered yet and admiring the nature around me, I suddenly start to smell smoke...Where does it come from?
Oh, I know, the smoke comes from the cigarette of that young girl sitting in the bank. How is it possible? Can you understand somebody is killing herself as well as disturbing others' time of relax?
- I cannot. It is totally unlogical to think that something we all know is bad for our health and with the power of killing us, continues being more and more sold everyday despite the campaigns against it.
Moreover, it is okay you do what you want with yourself but why the rest of people have to suffer you smoking? I totally agree with the law of non-smoking in public spaces and I consider it will never change, without regarding what others say.