4. Smoking prevents rare skin cancer
 said that he would not recommend smoking, even to members of the population who have been studied.
"This study shows that smoking produces a lower risk of rare and potentially fatal disease," he concluded.
(source: Smoking Cuts Risk of Rare Cancer http://www.data-yard.net/10b/kaposi.htmThe approaching literature: Dr. James Goedert, Risk factors for classical Kaposi sarcoma in a population-based case-control study in Sicily
Article: Does Smoking Reduce Kaposi's Sarcoma Risk?
5. Smoking reduces the risk of Breast Cancer
 reported that carriers of certain gene mutations (which tend to be carriers of breast cancer). If a woman smokes up to 4 pack years, the reduction is 35 percent, for 4 packs or more per year, the reduction is 54 percent, "said Jean-Sebastien Brunet, a study leader published in the Journal of the National Cancer Institute.
- Who smoked for more than 20 packs per year (ie, the number of packs per day multiplied by the number of years of smoking) according to statistics apparently decreased significantly by 54 percent in incidences of breast cancer when compared to carriers who never smoked. One of the strengths of this study is that the decrease in incidents exceeds the 50 percent threshold.