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(2015) in Heroin on Trial: Systematic Review and Meta-Analysis of Randomised Trials of Diamorphine-Prescribing as Treatment for Refractory Heroin Addiction, marijuana has addiction rates of approximately 9%, increasing to 17% for those who start young and up to 50% for daily users, highlighting its potential for dependence and long-term use disorders

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Younger e-cigarette users were more likely to have never smoked cigarettes, and older e-cigarette users were more likely to be current or former cigarette smokers

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Although global data remain limited, population-based studies in other countries confirm similar disparities 6