HOW DOES SMOOKING CAUSE CANCER ?

Tobacco smoke contains at least 80 different cancer-causing substances. When you inhale smoke, these chemicals enter your lungs and spread around the rest of your body. 

Scientists have shown that these chemicals can damage DNA and change important genes. This causes cancer by making your cells grow and multiply out of control. Cancer-causing chemicals in tobacco smoke 

•Tar - a mixture of dangerous chemicals 

•Arsenic - used in wood preservatives 

•Benzene - an industrial solvent, refined from crude oil 

•Cadmium - used in batteries 

•Formaldehyde - used in mortuaries and paint manufacturing 

•Polonium-210 - a highly radioactive element 

•Chromium - used to manufacture dye, paints and alloys 

•1,3-Butadiene - used in rubber manufacturi-ng 

•Polycyclic aromatic hydrocarbons - a group of dangerous DNA-damaging chemicals 

•Nitrosamines - another group of DNA-dama-ging chemicals 

•Acrolein - formerly used as a chemical wea-pon 

•Other chemicals Harms of Smoking, Lung, breast Cancer Risk Factors Other poisons in cigarette smoke Hydrogen cyanide - used as an industrial pesticide

•Carbon monoxide - found in car exhausts and used in chemicals manufacturing 

•Nitrogen oxides - a major component of smog 

•Ammonia - used to make fertilisers and explosives 

•More poison Older women who smoke cigarettes or have smoked for long periods of time may be up to 40 percent more likely to develop breast cancer than women who never smoked, according to a new study. The results showed a 30 to 40 percent increased risk of breast cancer among: - Women who were current or long-term smokers (a pack a day for 11 years or more) - Women who started smoking at a younger age - Women who started smoking before the birth of their first child The study also showed that women who had smoked cigarettes for 20 years or more and used combination hormone replacement therapy were more than twice as likely to develop breast cancer as women who have never smoked or used hormone replacement therapy.