Keywords: Addiction/Substance Use, Behaviour Modification (e.g., provision of item/tool, incentives, goal setting), Clinic, Correctional Institution, Education / Awareness & Skill Development / Training, High Risk Group (e.g., adolescent parents, elderly, homeless, substance users), Indigenous peoples, Low Socioeconomic Status, Mental Health, Meta-analysis, Phone, School, Smoking Cessation/Tobacco Use, Social Support (e.g., counseling, case management, outreach programs) , Youth Health