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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.

From: Concurrent crack and powder cocaine users from Sao Paulo: Do they represent a different group?

  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