I do not smoke and haven't taken up the habit, but as a curious teenager like most i have tried a cigarette. My parents being Christians indoctrinated smoking as a bad from a child which deterred me from doing it, although i have tried a cigarette the reason i never pick up thew habit is that i find it pointless. The reason i find smoking pointless is that in my opinion sucking on the end of a cigarette to exhale smoke when the money for the pack could be spent on something more useful like food. Aside from thinking buying a pack of 20 cigarettes for over £3 is a waste of money to smoke the health issues is another reason.
Smoking has been proven to be damaging to health and cause illnesses such as: cardiovascular disease, coronary thrombosis, cancer and many more illnesses. Smoking also makes its 'victims' crave for nicotine and stopping smoking can create with drawl symptoms. According to statistics smokers take 25% more sick days than non-smokers, smoking worsens asthma, smokers are also twice as likely to get macular degeneration.
Smoking has so many more than i mentioned bad effects on the human body it can be understood why smoking is seen as not a good thing the reason why i think it isn't wiped out is, because millions of people smoke around the world so it won't be easy to shut down and would cause an uproar. In the past it was seen as a cool thing to do and many people were smoking and adverts were there encouraging smoking as well as many famous people seen on posters with cigarettes. As i said before in the post i am a christian and in Christianity 1Corinthians 3:16 -17 its says "Don't you know you yourselves are God's temple and that God's Spirit lives in you? If anyone destroys God's temple, God will destroy him; for Gods temple is sacred, and you are that temple.
Therefore if i smoke and bring all these hazardous chemicals that God did not plant into my body am i not defiling his temple?, and making myself unclean, because the Holy Spirit cannot dwell in a dirty vessel.
References
http://www.netdoctor.co.uk/health_advice/facts/smokehealth.htm