Second-hand smoke (also called passive smoke or environmental tobacco smoke) is the combination of smoke from a burning cigarette and smoke exhaled by a smoker. The smoke that burns off the end of a cigarette or cigar actually contains more harmful substances than the smoke inhaled by the smoker. This means that people who don’t smoke but are regularly around those who smoke are exposed to the health risks of cigarette smoking.
How does second-hand smoke affect non-smokers?
Even if you don’t smoke but are exposed to second-hand smoke on a regular basis, your body will absorb nicotine and other harmful substances just as smokers’ bodies do. In addition, the longer you are around second-hand smoke, the greater the level of harmful substances in your body. As a result, you might have an increased risk of developing smoking-related disorders, including: * Lung cancer * Heart disease * Emphysema * Eye and nasal irritation * Asthma
Source: http://my.clevelandclinic.org/healthy_living/smoking/hic_dangers_of_second-hand_smoke.aspx
What is second-hand smoke?
Second-hand smoke is a combination of the sidestream smoke that flows directly from the burning end of a cigarette and the mainstream smoke that smokers inhale and then exhale.
The process of breathing other people's smoke is called 'passive smoking'.
How does second-hand smoke affect non-smokers?
Some of the immediate effects of being exposed to second-hand smoke can include eye irritation, headache, cough, sore throat, dizziness and nausea. Adults with asthma can also experience a significant decline in lung function when exposed to second-hand smoke.
Short-term exposure to tobacco smoke also has a measurable effect on the heart in non-smokers. Just 30 minutes of exposure is enough to reduce blood flow to the heart.
In the longer term, second-hand smoke exposure has been shown to increase the risk of developing a range of smoking-related illnesses. These