Research on the genetics of drug dependence indicates that
A) alcoholism and smoking are independent diseases.
B) alcoholism and smoking share common genetic factors.
C) smokers are high in status and achievement, but low in sensation seeking.
D) alcoholics are high in status and achievement, but low in sensation seeking.
E) environment plays a minimal role in drug abuse.
Answer: B
Rationale: The "high" produced by marijuana can be blocked by CB1 receptor antagonists.
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