1) Smoking affects your health. According to "Better Health Channel," smoking negatively impacts many of the body organs and systems. These include, the respiratory, the circulatory, the immune, the muscle and skeletal systems. It causes lungs cancer and adversely affects pregnancy. It also leads to low or unhealthy sperm count which usually results in impotence. http://www.betterhealth.vic.gov.au/bhcv2/bhcarticles.nsf/pages/Smoking_effects_on_your_body
2) Smoking especially in public places is an indication that the smoker does not love or care about other people. This is true because secondhand smoking kill thousands of people every year. One research puts it this way:
"More than one million people die annually because of smoking-related disease and the Third world, which accounts for 52% of world tobacco consumption, is making up a rapidly increasing proportion of those deaths." http://wol.jw.org/en/wol/s/r1/lp-e?q=smoking-related
3) Smoking does not show respect to God. The Bible book of 2 Corinthians 7:1, says that Christians should cleanse themselves of "every defilement of the flesh." Today, it has been proved beyond every doubt that smoking makes the body to become unclean or defiled. Would you like to displease God?
4) Smoking is costly. According to the Center for Disease Control (CDC), cigarette smoking cost more than $97 billion in lost productivity and another $96 billion in healthcare expenditures (a total of $193 billion), in United States between the year 2000 and 2004 alone. On individual bases, an adult tobacco smoker will save more than $1,100 annually if he or she quits smoking, according to tobaccofreekids.org.
5) Smoking is not friendly to the environment. It causes poor air quality. According to PubMed.gov, tobacco smoking produces carbon dioxide and the inhalation of more than 5% concentrations of it has harmful effect on the lungs.