Secondhand smoke...: From the us national cancer institute: at least 69 chemicals in secondhand smoke cause cancer. Secondhand smoke causes lung cancer in nonsmokers. Secondhand smoke has also been associated with heart disease, sudden infant death syndrome, ear infections, and asthma attacks. There is no safe level of exposure. Approximately 3, 000 lung cancer deaths occur each year in the us from sedondhand smoke.
Answered 4/12/2013
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