We found no relationship between using marijuana and seeking out peers who use marijuana, and no relationship with conduct problems. The findings, recently published in the journal Addiction, are based on a research project that Romer and his colleagues launched in 2004: the Philadelphia Trajectory Study
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Tobacco and psychoactive substance use among young people: levels are declining in France March 3, 2026 Par: National Committee Against Smoking Dernire mise jour: February 27, 2026 Temps de lecture: 9 minutes The 2024 results of the national EnCLASS survey, published by the French Monitoring Centre for Drugs and Drug Addiction (OFDT) [1] , The survey confirms an overall decrease in the use of psychoactive substances among middle and high school students in France, particularly tobacco and cannabis
