You cant make people stop by telling them how bad it is for them. I reckon that almost everyone knows that smoking is bad for you but they still do it. Same with diet, exercise and alcohol. Smoking is just the one that its really easy to ****. Everyone who doesnt smoke says oh its a filthy habbit, you shouldnt do that, its bad for you. What about alcohol, that isnt good for you but its acceptable. How many times have you seen someone arrested for smoking and disorderly.
If people want to smoke then let them, we shouldnt shove it down their throat because we dont like it. Its hippocritical and everyone knows what you say is true so at the end of the day they are ignoring you. Good on them I say. Stop trying to tell everyone what they should do with their lives, let them kill themselves if they want to.