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Your 20s Habits Haunt Your 50s Memory
31 Mar
Summary
- Daily smoking in young adulthood predicts worse memory by age 50.
- Binge drinking and cannabis harm memory indirectly via substance disorders.
- Damage from cigarettes appears cumulative, not solely dependent on continued use.
Research from the University of Michigan highlights the lasting effects of substance use in young adulthood on cognitive health into midlife. Daily smoking habits in one's 20s were found to predict worse self-reported memory by age 50. This effect persisted even if participants quit smoking by age 35.
For binge drinking and frequent cannabis use, the impact on memory was indirect. These behaviors increased the likelihood of developing substance use disorders by midlife, which in turn directly harmed cognitive health. Each wave of heavy drinking in young adulthood raised the odds of memory problems by 13 percent, with risks persisting for 30 to 40 years.
While the link between binge drinking and poor memory disappeared when accounting for alcohol use disorder, those with the disorder showed a 32 percent higher likelihood of reporting memory issues. Similarly, for cannabis, the risk of memory problems vanished if a disorder did not develop. Cigarettes, however, showed a different pattern, with cumulative damage from young adulthood contributing to memory decline independently of continued smoking.
The study used self-rated memory as an indicator, with poor memory reported by about one in 10 participants by midlife. This research underscores the importance of understanding long-term risk factors for cognitive decline, as poor memory can be an early sign of dementia.
