Purpose: To assess whether problematic Internet use is associated to substance use among adolescents.
Methods: Survey among 3067 8th graders in Switzerland (mean age 14 years, 50.3% females). Using the Internet Addiction Test (IAT), we divided the sample into non problematic (NPU: IAT<50, N = 2708) and problematic users (PU: IAT>49; N = 360). Groups were compared regarding age, gender, family structure, emotional wellbeing, academic performance, main Internet use purpose, self-reported current smoking, alcohol misuse (drunkenness), cannabis use, and use of other illegal drugs. A logistic regression for each substance was performed including demographic variables significant at the bivariate level using STATA 12. Results are given as adjusted Odds Ratios (aOR) with 95% confidence intervals.