WARNING: Cigarettes carry serious health risks, which are more prevalent than with other tobacco products. Nicotine, a chemical in tobacco, which is used to manufacture cigarettes. Cigarette use by pregnant women has also been shown to cause birth defects, including low birth weight, fetal abnormalities, and premature birth. Second-hand smoke from cigarettes causes many of the same health problems as smoking, including cancer. Additionally, cigarettes are a frequent source of fires leading to loss of lives in private homes.