Researchers suspect that drugs such as nicotine,alcohol,heroin,cocaine,and even marijuana produce pleasurable effects by increasing the levels of the neurotransmitter dopamine-the brain's___________ agent.

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Dopamine is known to play a role in the brain's reward system. Increased levels of dopamine are associated with feelings of pleasure and reinforcement, which may contribute to the addictive properties of drugs such as nicotine, alcohol, heroin, cocaine, and marijuana.

Researchers Suspect That Drugs Such as Nicotine,alcohol,heroin,cocaine,and Even Marijuana Produce