1) It reduces health costs,"...healthy people live to incur greater medical expenditure subsequently on average, more than compensating for the earlier excess expenditure related to obesity or smoking." -McPherson K (2008) Does Preventing Obesity Lead to Reduced Health-Care Costs? PLoS Med 5(2): e37. doi:10.1371/journal.pmed.0050037
2) It increases performance- Heishman SJ, Kleykamp BA, Singleton EG. Meta-analysis of the acute effects of nicotine and smoking on human performance. Psychopharmacology. 2010;210(4):453-469. doi:10.1007/s00213-010-1848-1
3) It increases IQ-"... nicotine acts to enhance physiological processes underlying performance on intellectual tasks".Smoking and Raven IQ Psychopharmacology (1994) 116:382-384
4) It reduces Parkinson's disease-"...This meta-analysis shows that there is strong epidemiological evidence that smokers and coffee drinkers have a lower risk of Parkinson's disease".-Hernán, Miguel A., et al. "A meta‐analysis of coffee drinking, cigarette smoking, and the risk of Parkinson's disease." Annals of neurology 52.3 (2002): 276-284.
5) If you like slim, body weight tends to be lower among smokers than among nonsmokers-Chatkin, Raquel, & Chatkin, José Miguel. (2007). Smoking and changes in body weight: can physiopathology and genetics explain this association?. Jornal Brasileiro de Pneumologia, 33(6), 712-719.
6) Smoking is a protective factor for total knee replacement as nicotine promotes proliferation and collagen synthesis in chondrocytes.-Cigarette smoking and risk of total knee replacement for severe osteoarthritis among Chinese in Singapore – the Singapore Chinese health study.Leung, Y.-Y. et al. Osteoarthritis and Cartilage , Volume 22 , Issue 6 , 764 - 770)
7) Smoking has been observed to exert protective effects on both the development and progression of ulcerative colitis.-Lunney, P. C. and Leong, R. W. L. (2012), Review article: ulcerative colitis, smoking and nicotine therapy. Alimentary Pharmacology & Therapeutics, 36: 997–1008. doi: 10.1111/apt.12086
8) Smokers are less likely to develop pre-eclampsia (hypertension in pregnancy) than non-smokers-Karumanchi, S. Ananth, and Richard J. Levine. “How Does Smoking Reduce the Risk of Preeclampsia?” Hypertension 55.5 (2010): 1100–1101. PMC. Web. 6 Mar. 2016.
