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Moreover, smoking increases oxidative stress by inducing the production of reactive oxygen species (ROS), which directly damage cellular structures such as lipids, proteins, and DNA, contributing to tissue inflammation, cellular dysfunction, and the progression of chronic diseases

Largest Employers Archived February 10, 2016, at the Wayback Machine Hiroko Tabuchi

Bellybuttons can contain multiple types of bacteria and require regular cleaning

Nearly two-thirds of reproductive-age women in China are exposed to second-hand tobacco smoke at home and over half are exposed in the workplace, which raises the risk of complications in pregnancy, including stillbirths and infant death