Table 2

Agreement of each knowledge of health effect by smoking status (n=5986)

Knowledge of health effectNever smokers (n=1074)Former smokers (n=185)Current smokers (n=4732)Overall
%n%n%n%n
Smoking causes stained teeth95.0102696.117885.0402487.2*5288
Smoking causes lung cancer in smokers91.899690.216268.13,24473.0*4402
Smoking causes emphysema86.993587.215859.4285865.2*3951
Secondhand smoke causes lung cancer in non-smokers83.288976.913553.22,53159.2*3555
Smoking causes premature ageing76.082174.213147.32,26853.3*3220
Smoking causes CHD54.258159.210136.31,73740.2*2419
Smoking causes stroke35.440137.56016.079120.1*1252
Smoking causes impotence29.232029.34616.681419.2*1180
Knowledge of all health effects13.215116.3265.22617.0*438
  • * Differences between never, former and current smokers significant at p<001.