Body: Secondhand smoke (SHS) is classified as a “known human carcinogen” (cancer-causing agent) by the US Environmental Protection Agency (EPA), the US National Toxicology Program, and the International Agency for Research on Cancer (IARC – a branch of the World Health Organization).
Tobacco smoke is a mixture of gases and particles. It contains more than 7,000 chemical compounds. More than 250 of these chemicals are known to be harmful, and at least 69 are known to cause cancer.
SHS has been linked to lung cancer. There is also some evidence suggesting it might be linked to lymphoma, leukemia, and brain tumors in children, and cancers of the larynx (voice box), pharynx (throat), nasal sinuses, brain, bladder, rectum, stomach, and breast in adults.
An estimated 42,000 deaths from heart disease in people who are current non-smokers
About 3,400 lung cancer deaths in non-smoking adults
直接影響: 30 minutes of exposure causes change in the corner arteries, so SHS immediately affects the heart, blood vessels, and blood circulation in a harmful way. Over time it can cause heart disease, strokes, and heart attacks. There is no safe level of exposure to SHS. Any exposure is harmful.