Passive smoking means the involuntary process of inhaling smoke from any tobacco products like cigarettes, especially when you have smokers around you. Many people still don't know that, although they might not be actively smoking cigarettes, by inhaling the smoke of tobacco products like cigarettes from other people, they are indirectly smoking. This makes me remember when I was young, and my parents would warn me to avoid sitting next to a smoker. While I practically did not yield to any of their several warnings, I later got to know about the risks that are involved when you constantly inhale smoke from other people's cigarettes.
It has been researched that being a passive smoker increases one's risk of getting health problems like cancer of the lung. It also increases your risk of getting other cancers, and other related problems of the throat, larynx, etc. Researches have equally shown that being a passive smoker can increase one's chance of getting some heart-related problems.