For the first time the rates of cannabis dependence are revealed in a nationally representative sample in Brazil. The Second Brazilian National Alcohol and Drugs Survey (BNADS) developed by the National Institute of Policies on Alcohol and Drugs (INPAD) and the Federal University of Sao Paulo (UNIFESP) investigated the consumption of all psychotropic drugs and several risk factors for addiction. Dependence was assessed among cannabis and cocaine users. The survey interviewed 4607 participants aged 14 and older from 149 cities across the country.
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