Fact
Cigarette companies advertised "light" cigarettes as less harmful to the smoker, although they can deliver the same levels of tar and nicotine.
Source 1:
National Cancer Institute. "Risks Associated with Smoking Cigarettes with Low Machine-Measured Yields of Tar and Nicotine." Bethesda, MD: "Smoking and Tobacco Control." U.S. Department of Health and Human Services, Public Health Service, National Institutes of Health, National Cancer Institute. Bethesda, MD. Risks Associated with Smoking Cigarettes with Low Machine-Measured Yields of Tar and Nicotine. 19 Nov. 2001. 21, 245-246.
http://cancercontrol.cancer.gov/brp/tcrb/monographs/13/m13_complete.pdf