Heroin (n = 200)

Cannabis (n = 159)

Tobacco (n = 149)

Cocaine (n = 119)

Alcohol (n = 75)

Starting age (in years)

[10 - 20[

42 (21.0%)

51 (32.1%)

45 (30.2%)

25 (21.0%)

29 (38.7%)

[20 - 30[

102 (51.0%)

75 (47.2%)

70 (47.0%)

62 (52.1%)

35 (46.7%)

[30 - 40[

40 (20.0%)

26 (16.3%)

25 (16.8%)

23 (19.3%)

7 (9.3%)

[40 - 50[

16 (8.0%)

7 (4.4%)

9 (6.0%)

9 (7.6%)

4 (5.3%)

Mode of consumption

Smoked

103 (51.5%)

159 (100%)

145 (97.3%)

106 (89.1%)

-

Injected

97 (48.5%)

-

-

10 (8.4%)

-

Chewed

-

-

3 (2.0%)

-

-

Inhaled (snorted)

-

-

1 (0.7%)

3 (2.5%)

-

Frequency

Every day

199 (99.5%)

-

-

119 (100%)

-

Once a week

1 (0.5%)

-

-

-

-

Number of drinks, cigarettes or joints per day

[0 - 5[

-

100 (62.9%)

15 (10.1%)

-

60 (80.0%)

[5 - 10[

-

33 (20.8%)

30 (20.1%)

-

11 (14.7%)

[10 - 15[

-

17 (10.7%)

20 (13.4%)

-

3 (4.0%)

[15 - 20[

-

9 (5.7%)

17 (11.4%)

-

1 (1.3%)

[2 - 250[

-

-

41 (27.5%)

-

-

[25 - 30[

-

-

20 (13.4%)

-

-

[30- and more[

-

-

6 (4.1%)

-

-

Number of drunkenness per Month

[0 - 10[

-

-

-

-

69 (92.0%)

[10 - 20[

-

-

-

-

4 (5.3%)

[20 - 30[

-

-

-

-

2 (2.7%)