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Table 3 Age specific prevalence of different types of smoking among adults aged 15–50, Tehran, 2013–2015

From: Lifetime prevalence and correlates of smoking behavior in Iranian adults’ population; a cross-sectional study

Variables Study population N (%) < 30 years 30–50 years
Waterpipe Smoking
 Never 803 (76.10) 337 (69.77) 466 (10.5)
 Lifetime 252 (23.90) 147 (30.63) 105 (18.39)
 Current 176 (16.60) 120 (24.64) 56 (9.81)
 Past 76 (7.20) 27 (5.59) 49 (8.58)
 Age at first waterpipe Smoking 20.30 (5.65) 17.91 (3,71) 23.62 (6.30)
Waterpipe Smoking – duration (years)
  ≤ 5 109 (10.35) 80 (73.040) 29 (26.60)
  > 5 143 (13.55) 67 (46.85) 76 (53.15)
Waterpipe Smoking – cumulative amount (pipes)
  ≤ 250 121 (11.5) 68 (56.20) 53 (43.80)
  > 250 127 (12.1) 76 (59.84) 51 (40.16)
Cigarette smoking
 Never 843 (79.75) 403 (47.86) 440 (52.14)
 Lifetime 214 (20.25) 82 (38.32) 132 (61.68)
 Current 152 (14.38) 63 (41.45) 89 (58.55)
 Past 62 (5.87) 19 (30.63) 43 (69.37)
Age at first cigarette smoking 19.67 (4.71) 17.90 (3.37) 20.34 (4.74)
Cigarette smoking – duration (years)
  ≤ 10 122 (11.5) 69 (56.56) 53 (43.33)
  > 10 92 (8.70) 13 (14.13) 79 (85.87)
Cigarette smoking (total pack-years)
  ≤ 5 165 (15.60) 74 (44.85) 91 (55.15)
  > 5 46 (4.40) 7 (15.22) 39 (84.78)
Second-Hand Smoking
 Never 664 (63.00) 306 (46.50) 358 (53.50)
 Lifetime 390 (37.00) 178 (45.64) 212 (54.36)
Second-Hand Smoking – duration (years)
  ≤ 10 101 (9.58) 57 (56.44) 44 (43.56)
 10–20 139 (13.19) 69 (49.64) 70 (50.36)
  > 20 150 (14.23) 52 (34.67) 98 (65.33)
Second-Hand Smoking – age period
 Before 19 years old 170 (16.13) 91 (53.53) 79 (46.47)
 After 20 years old 80 (7.59) 29 (36.25) 51 (83.75)
 Throughout life 140 (13.28) 58 (41.43) 82 (58.57)