Table 2

Smoking habits in subjects with chronic bronchitis (CB), chronic cough (CC), chronic expectoration (CE) or no symptoms, according to presence or absence of comorbid illnesses

No CC, no CECBCCCE
With comorbidityWithout comorbidityWith comorbidityWithout comorbidityWith comorbidityWithout comorbidityWith comorbidityWithout comorbidity
Subjects n177211700245336207468121269
Current smokers14.920.228.257.426.150.019.827.1
 1–14 pack-yrs58.361.030.943.141.537.361.966.7
 15–24 pack-yrs23.320.723.722.524.423.714.315.0
 ≥25 pack-yrs18.518.345.534.434.139.023.818.3
 <1 cig·day−12.34.401.53.71.701.4
 2–20 cig·day−168.667.746.442.551.935.562.561.6
≥20 cig·day−129.228.153.656.044.562.837.537.0
 Duration yrs24.1±15.321.9±12.929.3±16.824.3±13.725.1±13.324.3±12.925.0±16.619.9±12.4
Exsmokers34.029.631.419.430.918.441.332.3
 1–14 pack-yrs43.458.829.035.647.354.235.653.2
 15–24 pack-yrs19.918.023.218.70.115.324.421.5
 ≥25 pack-yrs60.423.247.845.843.530.640.025.3
 <1 cig·day−13.85.02.64.66.34.70.02.3
 2–20 cig·day−155.256.942.946.245.353.560.060.9
 ≥20 cig·day−141.038.154.549.248.441.940.036.8
 Duration yrs23.4±14.118.0±12.025.0±14.326.1±13.423.2±15.419.8±12.726.1±12.720.3±12.2
Nonsmokers51.150.340.423.243.031.638.840.5
  • Data are expressed as % of the population unless otherwise stated