A recent study found that 9 out of 10 smokers who started using chewing tobacco
as a smoking cessation aid were still daily smokers six months later.
Source: The U.S. Substance Abuse and Mental Health Services Administration (SAMHSA) Special Report: Smokeless tobacco use, initiation, and relationship to cigarette smoking: 2002 to 2007. http://oas.samhsa.gov/2k9/smokelessTobacco/smokelessTobacco.cfm