Secondhand smoke exposure and risk of lung cancer in Japan: a systematic review and meta-analysis of epidemiologic studies.

Individuals who are regularly exposed to secondhand smoke may have a high tendency to develop lung cancer.

This study examined the effect of exposure to secondhand smoke on lung cancer risk in Japanese men and women. Researchers conducted a systematic review on data and evidence obtained from 4 cohort and 5 case-control studies. They found out that subjects who were regularly exposed to secondhand smoke had high lung cancer risk. The results of this study suggest that high exposure to secondhand smoke may promote the development of cancerous cells in the lungs.