Smokeless Tobacco Use, Initiation, and Relationship to Cigarette Smoking: 2002 to 2007
"# The rate of past month smokeless tobacco use remained relatively stable in the range of 3.0 to 3.3 percent between 2002 and 2007 among persons aged 12 or older; however, there were increases among certain subpopulations—in particular, among adolescent males
# Among past month smokeless tobacco users, 85.8 percent used cigarettes at some time in their lives, and 38.8 percent used cigarettes in the past month
# Among persons who had used both smokeless tobacco and cigarettes in their lifetime, 31.8 percent started using smokeless tobacco first, 65.5 percent started using cigarettes first, and 2.7 percent initiated use of smokeless tobacco and cigarettes at about the same time."