High exposure to second-hand smoke may be a significant risk factor for colorectal cancer.

This study evaluated the correlation between passive smoking and colorectal cancer risk. A team of Chinese researchers analyzed data extracted from six case-control and six cohort studies.

The research team discovered that a surge in the risk of colorectal cancer, particularly rectal cancer, was associated to high exposure to second-hand smoke. According to this study, male passive smokers were found to be higher risk of developing colorectal cancer than female passive smokers. The findings of this study provide strong evidence that support the hypothesis that passive smoking may be a contributing factor to the development of colorectal cancer.