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We explore what brain science says about alcohol and marijuana, why young brains are more vulnerable, and how clarity, sleep, and mood change when people step away from use. We weigh legality against neurobiology and ask what choices truly protect your future.

• alcohol as a central nervous system depressant 
• slowed reaction time, impaired judgment, disrupted sleep 
• links to brain volume loss and dementia risk 
• gen Z trends: less alcohol, more marijuana 
• marijuana’s effects on attention, memory, coordination 
• reduced blood flow and activity in key brain regions 
• higher anxiety, depression, suicidal thoughts with regular use 
• psychosis risk in genetically vulnerable subgroups 
• developing brain risk through age 25 
• is any use brain safe and tradeoffs of “moderate” use 
• reported benefits of stopping: better sleep, less anxiety, more motivation 
• personal responsibility, driving safety, and community impact

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