Alcohol is addictive due to its effects on the brain and nervous system. When alcohol is consumed, it affects the release of neurotransmitters, such as dopamine, which is responsible for feelings of pleasure and reward. With regular use, the brain adapts to the presence of alcohol and the release of dopamine becomes less efficient, leading to a tolerance for alcohol. This can lead to an increased need for alcohol to achieve the same effects, which can result in physical dependence and addiction. Additionally, alcohol withdrawal can be dangerous and uncomfortable, further contributing to addiction. On Reddit, there are many communities dedicated to discussing addiction and recovery, where users can find support and advice.