History of cannabis

1928 Cannabis use made illegal in Britain

1971 Misuse of Drugs Act becomes law and drug classifications introduced for the first time. Cannabis is a Class B drug

2004 Home secretary David Blunkett accepts Advisory Council on Misuse of Drugs guidance to downgrade to Class C

2008 New home secretary Jacqui Smith upgrades cannabis to a Class B drug

2012 Home affairs select committee report calls for the drug to be reclassified as less harmful, but the advice is ignored

2018 Medical cannabis review