Note: For adolescents aged 12-17 years, current smokers were persons who reported smoking cigarettes during the preceding 30 days. For young adults aged 18-24 years, current smokers were persons who reported that they had smoked > 100 cigarettes (about 5 packs) in their lifetime and smoked during the preceding 30 days. Current smokers may include nondaily smokers. Indicators of nicotine dependence were (1) "felt [they needed] or were dependent on cigarettes," (2) "needed larger amounts [more cigarettes] to get the same effect," (3) "felt unable to cut down on [their] use, even though [they] tried," and (4) "had withdrawal symptoms, that is, felt sick because [they] stopped or cut down on cigarette use."

The analysis of "unable to cut down" and "felt sick" was restricted to persons who reported trying to reduce their use of cigarettes during the preceding 12 months. In addition, for indicator "unable to cut down," because of the question design, respondents who reported not trying to reduce any drug use during the preceding 12 months were excluded from this analysis.

Current smokers who reported > 1 of the 4 indicators of nicotine dependence.Sources: Alcohol, Drug Abuse, and Mental Health Administration, public use data tape, 1992; Substance Abuse and Mental Health Services Administration, public use data tapes, 1993, 1994-A.