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The study, led by Mark Pletcher of the University of California, San Francisco, compared the effects of both cigarette and marijuana smoking over a period of 20 years in a group of more than 5,000 adults, part of a longitudinal study called Coronary Artery Risk Development in Young Adults (CARDIA)

Experts have a few theories on why cannabis use is linked to reduced BMI and lower chance of obesity

The Z scores for mediation effects of learning efficacy, cynicism and emotional exhaustion were 2.23, 2.98 and 3.09 respectively, the values of mediation effects all exceeded |1.96| which meant the mediation effects of the dimensions of learning burnout were significant statistically, thus hypothesis 3 was partially supported