Chunk #30 — RESULTS — Marijuana use

Source

Exploring the relationship between genetic and environmental influences on initiation and progression of substance use.

Embedded

yes

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Of 438 individuals (22%) who reported having tried marijuana, 278 (62%) reported light use ( < six times during their life) and 160 (38%) reported heavier use (≥ six times during their life). There was a significant correlation between age and life-time use (r = 0.28)