My grandfather died from smoking related emphysema.
My father died from smoking related lung cancer, spreading to his brain (they killed the tumor in his lung, but not before it hit the lymphatic system).
So, personally, I'm against it. Smoked for 23-1/2 years myself, and quit back in November of 2004. So even though my lungs are a lot cleaner than they otherwise would've been, I still stand a better than average chance of seeing cancer or COPD from my years of smoking.
At the same token, if you're an asshole, I wholeheartedly support your decision to smoke, in hopes that you will die, before collecting much Social Security. Great way to extend the solvency of that program! :biggrin: