Passive smoking’s carcinogenic traces

Nonsmokers living with a smoker have an elevated risk of lung cancer. In efforts to pinpoint the reason, researchers have now found evidence of a potent tobacco-specific carcinogen in nonsmokers exposed to smoke at home.

In the past, researchers have linked cigarette smoke to lung cancer in nonsmokers by finding noncarcinogenic cigarette compounds, including nicotine, in nonsmokers’ blood or urine.