Lib Dem MP Sir Norman Lamb has predicted that Britain will completely legalise cannabis within 15 years.
Speaking to talkRADIO’s Mike Graham he said it was absurd that cannabis is illegal for recreational use but lawful for medicinal purposes.
“The very mundane act of putting three or four drops of cannabis oil under your tongue before going to sleep seems to me like an unexciting, uneventful thing to do,” he said.
“Yet it is a criminal act in the UK. It demonstrates just how ludicrous the current rules are in the UK.
“I advocate legalisation not because I’m into drugs; I’m instinctively quite hostile to the risky use of drugs, legal or illegal. But I think there’s a better approach to protecting young people.”
Sir Norman recently visited Canada with Conservative Jonathan Djanogly and Labour’s David Lammy. Canada became the first G7 country to legalise recreational cannabis in 2018.
The trip was organised by Volte Face, a pro-legalisation organisation. Mr Lammy said he supported decriminalisation in a move away from Labour’s official position.
“I want the market legalised, regulated and taken away from crime gangs,” he said. “I want to see the strength of the stuff reduced, labelled and properly organised in this country."
Mr Djanogly told BBC's Newsbeat: "I think we have got a lot to learn before the legalisation of recreational cannabis, which I think will happen at some point."
Sir Norman had previously led his party's decision to back the legalisation of cannabis.
He became possibly the first serving British MP to openly take a cannabis product on camera after sampling the drug's oil, which unlike its form in the UK included THC.
THC is a compound within cannabis which gets users high.