Except tortoises do live in the wild on sand. People are not born smoking. I get what you're saying but....Do you know anyone that smokes? Had any friends or relatives that smoked and yet still lived to a ripe old age? I did and do. Why do some people get lung cancer or emphysema and die, and others don't? Why do some people get away with something that is clearly risky, and other people doing the same thing die? I don't know the answer, but I still think it is good advice to tell people not to smoke. When people tell me they have been smoking for years and they are fine, I quietly wonder just how "fine" they really are.