Table 1 Characteristics of adult smokers in the sample (n = 15 450)
Canada, n = 3795USA, n = 4453Australia, n = 3457UK, n = 3745
Age (%, years):
    18–2415.514.616.89.1
    25–3932.329.837.133.6
    40–5435.435.232.333.9
    55+16.820.513.723.4
Sex, male (%)45.643.947.343.9
Education (%):
    Low46.944.665.662.9
    Medium39.140.620.524.2
    High13.914.813.912.8
Identified minority group (%)11.322.213.34.9
Cigarettes per day (%)
    1–1031.832.731.530.0
    11–2042.645.139.353.7
    21–3021.313.122.111.5
    31+4.39.07.14.8
Cohort (n):
    Wave 12214213823052401
    Wave 2517684258255
    Wave 3545889532586
    Wave 4519742362503
  • Percentages are based on unweighted data.