But if all these reasons just aren't enough, then quit smoking to save the planet! Carbon monoxide and nitrous oxides, found in tobacco smoke, can have a negative impact on the environment. It's never too late to stop smoking and save yourself. Continue for more tips to quit smoking .
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Smoking during pregnancy can cause adverse health effects in both the woman and the fetus. The 2008 US Guideline determined that "person-to-person psychosocial interventions" (typically including "intensive counseling") increased abstinence rates in pregnant women who smoke to %, compared with % in usual care.  :165–167 Mothers who smoke during pregnancy have a greater tendency towards premature births. Their babies are often underdeveloped, have smaller organs, and weigh much less compared with the normal baby. In addition, these babies have worse immune systems, making them more susceptible to many diseases in early childhood, such as middle ear inflammations and asthmatic bronchitis which can bring about a lot of agony and suffering. As well, there is a high chance that they will become smokers themselves when grown up. A systematic review showed that psychosocial interventions help woman stop smoking in late pregnancy and can reduce the incidence of low birthweight infants. 
This is the home page of VA's Tobacco and Health website for Veterans, their families and health professionals.
Finally, quitting smoking saves money. The average cost of a pack of cigarettes is approximately $ a pack (depending on where you live). A smoker with a pack a day habit spends approximately $ per week ($2,288 per year).