This study found that:

  • Marijuana users exhibited six different patterns of marijuana use from ages 18 to 50.
  • Longer-term marijuana use (extending from age 18 into the late 20s or beyond) was associated with increased risk of self-reported health problems at age 50.

Attitudes and policies regarding recreational marijuana use are becoming increasingly permissive. To effectively address the implications of these developments, researchers and policy makers need to understand how much and how long people use marijuana during the lifespan, and the degree to which different use patterns are associated with long-term issues such as health status.

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