Answer:
Passive smoking is the inhalation of smoke, called second-hand smoke, or environmental tobacco smoke, by persons other than the intended "active" smoker. It occurs when tobacco smoke permeates any environment, causing its inhalation by people within that environment.
People who breathe in secondhand smoke regularly are more likely to get the same diseases as smokers, including lung cancer and heart disease. Pregnant women exposed to passive smoke are more prone to premature birth and their baby is more at risk of low birthweight and cot death.
In humans, active smoking can cause pregnancy problems, as well as diseases of the respiratory and cardiovascular systems. Nicotine is the main component which makes tobacco addictive
There are healthy benefits of quitting smoking that occur almost as soon as one stops smoking, but there are a number of other changes the body experiences when trying to kick the habit. Nicotine withdrawal can be a difficult part of trying to quit smoking