Other questions in this quiz

2. The number of non users had...

  • Trebled
  • Doubled
  • Not changed

3. 106 participants had...

  • stopped using cocaine by the end of the study
  • increased their heroin intake by the end of the study

4. The addicts became more truthful about their cocaine use over the course of the study

  • True
  • False

5. What was their mean age?

  • 30
  • 23
  • 19
  • 45

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