Joking or not, tobacco use does not just cause cancer. Lung diseases are very nasty. I watched my mother die from lung disease. It took a long, long time for her to die. Trust me, you don't want to risk it. If you say that it cannot happen to you, I simply ask, what makes you so darn special?
The really interesting part of lung diseases is that very often the treatment gets to be nearly as nasty in the long run as the ailment. Don't want to use the medications? Fine, get used to not breathing.
Tobacco is probably as additctive as heroin. Very difficult to stop using it. Growing up in a household with smokers didn't do my lungs any good either, for that matter, but after many years of not being in that environment there is improvement.
So, if you want to smoke, it is your right. I just wish it was my right not to be subjected to higher insurance rates and tax rates to subsidize the medical care of self-inflicted misery. And therefore, spoofing or not, don't give me the "it only effects me" crap. Health, economic, and emotional costs are a little bit high from my personal experience. It has to be the absolute dumbest habit to acquire if just because of the damage it does to everyone, not just the smoker.