As with many drugs of abuse,the positively reinforcing effects of ethanol are thought to be ultimately the result of the activation of the following neurotransmitter:

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The positively reinforcing effects of ethanol are thought to be ultimately the result of the activation of the dopamine neurotransmitter system in the brain. This is why ethanol is considered to have addictive properties, as dopamine release in the brain's reward pathway contributes to the development of addiction.

As with Many Drugs of Abuse,the Positively Reinforcing Effects of Ethanol