Table 6 Estimated 6‐month prevalence of cessation attempts among adolescent smokers according to level of cigarette consumption* and period of adolescence.

Country, study year	Age/grade range	Definition of cessation in the past 6 months	Prevalence (%) (95% CI)
Any use (in the past month)
Early to middle adolescence
Canada, 199437	Age 10–14	Tried to quit	41†
			65‡
			22§
United States, 198975	Age 12–13	Made at least one serious attempt to quit smoking cigarettes	73 (67 to 78)‡||
Middle adolescence
United States, 198975	Age 14–15	Made at least one serious attempt to quit smoking cigarettes	68 (66 to 72)‡||
Early to late adolescence
Canada, 199437	Age 10–19	Tried to quit	44†
			48‡†
			33§†
United States, 198975	Age 12–18	Made at least one serious attempt to quit smoking cigarettes	57 (56 to 59)‡†||
Middle to late adolescence
Canada, 199437	Age 15–19	Tried to quit	45†
			44‡
			52§
Late adolescence
United States, 198975	Age 16–18	Made at least one serious attempt to quit smoking cigarettes	52 (50 to 54)‡||
Daily use (in the past week)
Early to middle adolescence
Canada, 200270	Grade 5–9	Tried to quit	57
Daily use (in the past month)
Early to middle adolescence
Canada, 199437	Age 10–14	Tried to quit	64‡¶**
Early to late adolescence
Canada, 199437	Age 10–19	Tried to quit	41‡†¶**
United States, 198930	Age 12–19	Tried to quit	52 (<10 cigarettes per day)‡
			49 (⩾10 cigarettes per day)‡
Middle to late adolescence
Canada, 199437	Age 15–19	Tried to quit	38‡¶**
Non‐daily use (in the past month)
Early to middle adolescence
Canada, 199437	Age 10–14	Tried to quit	65‡¶
Early to late adolescence
Canada, 199437	Age 10–19	Tried to quit	62‡†¶
Middle to late adolescence
Canada, 199437	Age 15–19	Tried to quit	60‡¶

*Any use in the past month was defined operationally as “smoked ⩾1 cigarette in the past 30 days”; daily use in the past week was defined operationally as: “smoked cigarettes on each of the 7 days preceding data collection”; daily use in the past month was defined operationally as: “smoked⩾1 cigarette each day in the past 30 days”; non‐daily use in the past month was defined operationally as: “smoked ⩾1 cigarette in the past 30 days, but not daily”.

†Excluded from the calculation of summary estimate because complete stratum‐specific estimates were available for this study.

‡Estimated among the subgroup of adolescents who had smoked ⩾100 cigarettes in their lifetime.

§Estimated among the subgroup of adolescents who had smoked <100 cigarettes in their lifetime.

||Three reports³⁰,⁷⁴,⁷⁵ were based on the 1989 US Teenage Attitudes and Practices Survey. When estimates for duplicate age and/or smoking history strata were available, only Moss et al⁷⁵ was considered in the calculation of summary estimates. Estimates of the 6‐month prevalence of cessation attempts among adolescents reporting any use in the past month for duplicate age strata were as follows: 65 and 55 among 12–18 year olds as reported by Allen et al⁷⁴ and Zhu et al,³⁰ respectively; 80 among 12–13 year olds as reported by Allen et al;⁷⁴ 75 among 14–15 year olds as reported by Allen et al;⁷⁴ and 60 among 16–18 year olds as reported by Allen et al.⁷⁴

¶Estimate was derived by multiplying the proportion who ever tried to quit by the proportion of ever quitters who tried to quit in the past 6 months.

**Additional data were reported on the 6‐month cessation attempt prevalence according to the frequency of daily consumption among adolescents who had consumed ⩾100 cigarettes in their lifetime and who had ever tried to quit smoking, as follows: age 10–14: 83 (1–5 cigarettes per day), 73 (6–10 cigarettes per day), 68 (11–15 cigarettes per day), 77 (16–20 cigarettes per day), 84 (⩾25 cigarettes per day); age 15–19: 70 (1–5 cigarettes per day, 60 (6–10 cigarettes per day), 49 (11–15 cigarettes per day), 33 (16–20 cigarettes per day), 46 (21–25 cigarettes per day); age 10–19: 75 (1–5 cigarettes per day), 63 (6–10 cigarettes per day), 52 (11–15 cigarettes per day), 40 (16–20 cigarettes per day), 50 (21–25 cigarettes per day), 68 (⩾25 cigarettes per day).