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Aims  To establish the long‐term efficacy of a universal internet‐based alcohol and cannabis prevention programme in schools.

Methods  A cluster‐randomized controlled trial was conducted to assess the effectiveness of the Climate Schools: Alcohol and Cannabis Course. The evidence‐based course, aimed at reducing alcohol and cannabis use, is facilitated by the internet and consists of 12 novel and curriculum consistent lessons delivered over 6 months.

Participants  A total of 764 year 8 students (13 years) from 10 Australian secondary schools were allocated randomly to the internet‐based prevention programme (n = 397, five schools), or to their usual health classes (n = 367, five schools).

Measures  Participants were assessed at baseline, immediately post, and 6 and 12 months following completion of the intervention, on measures of alcohol and cannabis knowledge, attitudes, use and related …