According to opponent-process theory, habitual drug abusers need higher doses because:

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Opponent-process theory suggests that drug use triggers both a primary reaction (e.g. pleasure) and an opposite, after-reaction (e.g. withdrawal). Over time, this after-reaction becomes stronger and is triggered even by stimuli associated with drug use. This explains why habitual drug users need higher doses - to experience the primary reaction they desire despite the stronger after-reaction.

According to Opponent-Process Theory, Habitual Drug Abusers Need Higher Doses