Scientists from Sweden investigated the influence of Smoking on the genetic apparatus. Are as follows: carcinogens, nicotine and tar affect the operation of the Y chromosome in men. In some cases complete loss of chromosomes.
Specialists in the study proved that smokers lose a large part of the functional activity of the Y chromosome. This affects the life expectancy of men.
The combustion products of tobacco have a carcinogenic effect on the body, increase the likelihood of cancer, diseases of the cardiovascular and respiratory systems. The body of a woman in terms of genes more accessible to external influences (women have two complete X-chromosome), so the smoke is more dangerous for men.
Note, the process of degradation of the Y chromosome pay if you give up bad habits and stick to a healthy lifestyle for a long time.