Table 2.

Comparison of history of legal and illegal drugs in the Powder Cocaine Users, Crack Cocaine Users and Dual Users groups and in the total sample.

	Powder Cocaine Users		Crack Cocaine Users		Dual Users		Total	pvalue
Alcohol
<50 units/week	92	58%	40	73%	299	63%	431	p > 0.05
>50 units/week	66	42%	15	27%	175	37%	256
Smoking
yes	117	74%	46	85%	425	88%	588	p > 0.001
no	41	26%	8	15%	60	12%	109
Cannabis
never used	11	7%	6	11%	8	2%	25	p > 0.0001
ever used	147	93%	49	89%	469	98%	665
Solvents
never used	70	44%	29	53%	118	24%	217	p > 0.0001
ever used	88	56%	26	47%	367	76%	481
Heroin
never used	153	97%	54	98%	459	94%	666	p > 0.05
ever used	5	3%	1	2%	27	6%	33