1. Better Health Channel. URL: https://www.betterhealth.vic.gov.au/health/healthyliving/smoking-effects-on-your-body Visited on 26 November 2015
2. Higgambottam, Shipley M.J., Rose G. (1982) Cigarettes, lung cancer, and coronary heart diseases: the effects of inhalation and tar yield. J Epidemiol Community Health. 36(2): 113–117.
3. Lam P.K., Lam Y.K. E. Biology Matters GCE 'O' level 2nd edition Marshall Cavendish Education
4. Livestrong URL: http://www.livestrong.com/article/188243-the-effects-of-tar-in-smoking/ Visited on 26 November 2015
5. Mishra A., Chaturvedi P., Datta S. et al (2015) Harmful effects of nicotine. Indian J. Med. Pediatri Oncol. 36(1): 24-31.