Some people are more susceptible to smoking related diseases than others. My family is one of those who should not be smoking, I lost my paternal grandmother, my paternal grandfather and two out of three paternal aunts to smoking related diseases, all died in their 60's. I still have my youngest aunt and my father, but for my father that's a small miracle, he's had smoking related heart attacks, lung cancer, and has COPD. He's in his mid 70's now, but he's had countless surgeries, is dependent on oxygen to breathe and has had a lowered quality of life for some 20 years.
And that's not counting all of my father's aunts, uncles and cousins who have died from smoking. They've been dropping like flies.
So, if you want to smoke, I guess the question is: Do you feel lucky?
Personally I don't get why people start smoking. Even if it doesn't kill you it costs money, it stinks, it gives bad breath, it's easy to become addicted, and your skin tends to age faster.