Table 1.

Frequency of lifetime drug use in adolescents for the 3 substance use categories

	Smoking		Alcohol		Marijuana
Age of substance use onset	M	F	M	F	M	F
Before 9 years old	0	0	2	0	0	0
9–10 years old	0	0	0	0	0	0
11–12 years old	0	0	0	1	0	0
13–14 years old	0	2	1	6	2	3
15–16 years old	1	2	2	5	1	3
17 years old or older	0	0	1	0	0	0
Total(%)	5(13.5)		18(48.7)		9(24.3)

Note. Smoking: more than one or two puffs; Alcohol: except for religious purpose; Marijuana: pot, weed, grass, hash; M= male, F=female