1. Nicotine delivery devices;Slade,1993
2. U.S. Department of Health and Human Services, 1981, The health consequences of smoking: the changing cigarette: a report of the Surgeon General, U.S. Govt. Printing Office, Washington
3. U.S. Department of Health and Human Services, 1989, Reducing the health consequences of smoking: 25 years of progress: a report of the Surgeon General, U.S. Govt. Printing Office, Washington
4. Smoking in relation to the death rates of 1 million men and women;Hammond,1966
5. Smoking habits and tar levels in a new American Cancer Society prospective study of 1.2 million men and women;Stellman;J Natl Cancer Inst,1986