http://tobaccocontrol.bmj.com/content/14/5/315.full
http://www.health.harvard.edu/newsletters/Harvard_Mens_Healt...
You can find more with a simple search on Google. I used, "light smoking, dangerous".
http://www.health.harvard.edu/newsletters/Harvard_Mens_Healt...
You can find more with a simple search on Google. I used, "light smoking, dangerous".