Final answer:
The tobacco smoke inhaled by both smokers and non-smokers in a closed environment is known as secondhand smoke. It combines sidestream smoke from the burning end of a cigarette and mainstream smoke exhaled by the smoker, containing numerous harmful chemicals that can lead to serious health issues.
Step-by-step explanation:
The tobacco smoke that is breathed by everyone in a closed room, including the smoker, is known as secondhand smoke. This type of smoke is a combination of sidestream smoke, which is emitted from the burning end of a cigarette, and mainstream smoke, which is the smoke exhaled by the smoker. Secondhand smoke contains over 7,000 harmful chemicals, many of which are toxic or carcinogenic, posing health risks such as respiratory infections, asthma, and increase in lung cancer and heart disease risks.
The tobacco smoke breathed by everyone in a closed room, including the smoker, is known as secondhand smoke, specifically referred to as sidestream smoke in this context.
Explain in 140 words: Secondhand smoke is the combination of sidestream and mainstream smoke inhaled by non-smokers in the vicinity of an active smoker. It's especially dangerous indoors where ventilation may be poor. This smoke carries serious health hazards, including lung cancer, heart disease, and respiratory infections. Steps such as having a smoke-free indoor environment are crucial to protect individuals from the dangers of secondhand smoke.