The ingredients and additives in cigarettes when burned, create toxic, harmful chemical compounds. Those chemicals, which number 4000 or more, contain poisons and carcinogens that damage our bodies when inhaled directly or indirectly through secondhand smoke. Scientists have yet to identify all of the chemicals present in cigarette smoke, but the body of knowledge on the deadly effects of smoking continues to expand.
It is not how many years we live, but what we do with them. Health Service Food and Human Resources: Discount Cigarettes Brands