With counsel from TIRC, tobacco companies began mass-marketing filtered cigarettes and low-tar formulations that promised a "healthier" smoke.

CNN: A brief history of tobacco

Alternatively, a depressed mother may be more likely to produce a child who is prone to depression - and to have a low birth weight baby because they may be more likely to smoke and drink during pregnancy.

BBC: NEWS | Health | 'Depression link' to small babies

The military said smoke from the pit exposed troops to toxic emissions, including low levels of cancer-causing dioxins.

CNN: Congressmen want more info on 'burn pit' claims

Thick smoke rose from the fast-moving fire, which was being fueled by high winds and low humidity, Dunn said, adding he expects the same conditions Sunday.

CNN: Florida brush fire prompts evacuations