Evaluating an alcohol harm-reduction campaign advising drinkers of the alcohol-cancer link

•Alcohol is carcinogenic and increases the risk of developing several cancers.•Informing people about the alcohol-cancer link may help to reduce alcohol harms.•The ‘Spread’ campaign was developed to inform people about the alcohol-cancer link.•Spread was well received and motivated positive behavioral changes.•Public health campaigns are likely to reduce population-level alcohol-related harms.