Competing interests: We have read and understood BMJ policy on declaration of interests and declare the following interests: IG has given a paid lecture for Kyowa Kirin, the manufacturer of Pabrinex vitamin B and C injection. He is chair of the Alcohol Health Alliance and resigned recently as co-chair of the alcohol leadership board, Public Health England. JB is director of the UK Centre for Tobacco and Alcohol Studies, a member (and former chair) of the Royal College of Physicians tobacco advisory group, and a member of the board of trustees of Action on Smoking and Health. He co-chairs the PHE tobacco control implementation board. LB is deputy director of the UK Centre for Tobacco and Alcohol Studies, holds the CRUK/BUPA chair in behavioural research for cancer prevention at Cancer Research UK, is a trustee of the Institute of Alcohol Studies, and a member of the PHE tobacco control implementation board.