A lot of studies have shown that tobacco smoking is hazardous to your health. It can cause lung disease, cancer, heart illness and birth defects among other deleterious consequences. Though the potential negative effects of tobacco smoking are significant, there are some other side effects to be aware of. Curiously, The University of Melbourne stated that tobacco is an effective appetite suppressant. Thus it could be used in treating overeating disorders like obesity.

However, it is unlikely medical professionals would recommend tobacco smoking for obese patients because it can cause interrelated health problems with obesity and hence, could be quite dangerous. Nicotine is known as an anti-inflammatory agent; therefore it reduces the possibility of smokers to have certain inflammatory disorders.

Useful links about tobacco.
http://www.sciencemag.org/content/332/6035/1330 - reference to the article about Tobacco being an appetite suppressant
http://www.druginfo.adf.org.au/drug-facts/tobacco - what tobacco is, the effects, getting help and tobacco in Australia
http://www.health.nsw.gov.au/public-health/health-promotion/tobacco/ NSW health info page about tobacco