Why are studies on the health effects of smoking among indiv

Why are studies on the health effects of smoking among individual who smoke not a concern of environmental epidemiology? Explain the reason why exposure to secondhand cigarette smoke is a concern of this discipline.

Solution

Exposure to second-hand cigarette smoke is of concern. This comprises both the smoke of the burning end of a cigarette and smoke exhaled by a smoker. Secondhand smoke is known to cause cancer as it contains about 70 chemicals that are cancerous. In adults, cancer due to exposure to secondhand smoke is likely to be seen in the larunx, pharynx, brain, stomach and breast. In children, it causes leukemia, lymphoma and brain cancers. in case of non-smokers, secondhand smoke also increases the chance of heart attack and stroke. Children whose parents are smokers are more likely to be affected by lung infections, cough and asthma.