Table 1.

Rates of lifetime substance use in high-risk subjects

	No use	Use without impairment	Abuse	Dependence
Substance	N (%)	N (%)	N (%)	N (%)
Alcohol	187 (54.7)	110 (32.2)	34 (9.9)	11 (3.2)
Cannabis	211 (61.9)	63 (18.5)	45 (13.2)	22 (6.5)
Hallucinogens	298 (87.4)	36 (10.6)	4 (1.2)	3 (0.9)
Cocaine	317 (92.7)	15 (4.4)	4 (1.2)	6 (1.8)
Stimulants	319 (93.5)	13 (3.8)	5 (1.5)	4 (1.2)
Opioids	328 (96.2)	12 (3.5)	1 (0.3)	0
Hypnotics	329 (96.5)	8 (2.3)	3 (0.9)	1 (0.3)
Other	321 (94.1)	14 (4.1)	4 (1.2)	2 (0.6)

Total N = 341 for all substances except for alcohol and cocaine (N = 342).