Russell needs more of the drug he has been using to get the normal high he got when he first started. Russell is experiencing ________.

A) drug tolerance
B) drug detoxification
C) withdrawal
D) overdrawal

Drug tolerance occurs when the body becomes accustomed to a drug's effects and requires larger doses to achieve the desired effect that was once achieved with a smaller amount. This is likely what's happening to Russell if he needs more of the drug to achieve the same high he got when he first started using it. Withdrawal (C) and overwithdrawal (D) refer to symptoms experienced when stopping or reducing drug use, rather than requiring more of the drug. Drug detoxification (B) is a process of removing drugs from the body and is not related to the symptoms Russell is experiencing.