Keywords: Addiction/Substance Use, Adolescents (13-19 years), Adults (20-59 years), Behaviour Modification (e.g., provision of item/tool, incentives, goal setting), Drug Abuse/Use, Education / Awareness & Skill Development / Training, Internet, Meta-analysis, Mobile Phone, Phone, Primary health care provider office (e.g., Public health nurse, dietitian, social worker), Smoking Cessation/Tobacco Use, Social Support (e.g., counseling, case management, outreach programs) , Youth Health