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Table 1 The amount and duration of smoking in acne and control patients

From: Acne and smoking: is there a relationship?

Smoking habit Acne patients (12) Control patients (27)
Amount 1 cigarette per week 2 5
  1–6 cigarettes per week 2 9
  > 6 cigarettes per week 8 12
  Not mentioned 0 1
Duration < 3 months 1 2
  3 months – 3 years 6 7
  > 3 years 5 16
  Not mentioned 0 2