&gt; I also found this totally strange that people pick up smoking cigarettes once they are old enough to know they are just horrible for you.<p>It doesn&#x27;t surprise me very much.  People choose to do a lot of things that are terrible for their body, like eating poorly or not getting exercise, and it&#x27;s not clear to me that cigarettes are even the worst choice they can make.<p>It would be interesting to see the long term effects of smoking 5 cigarettes a day versus being 50 pounds over weight.