First of all, that's a figure derived from studies based upon a lifetime of working with smokers in a "Mad Men" exposure era stretching from the 1940s through 1980s. read more
People can be exposed to secondhand smoke in homes, cars, the workplace, and public places, such as bars, restaurants, and recreational settings. In the United States, the source of most secondhand smoke is from cigarettes, followed by pipes, cigars, and other tobacco products . read more
Some get it because of secondhand smoke and some get it for unknown reasons. People who start smoking at younger ages are at higher risk later in life. Lung cancer rates begin increasing in the mid to late 40s and peak in the late 70s. read more