Twice as many British adults now support the legalisation of cannabis than oppose it, according to a poll which reveals a “widening gulf” between public opinion and drug laws.

Forty-eight per cent of voters favour legalising recreational use of marijuana, up five points in the past year, with only 24 per cent objecting, found the YouGov survey.

Support for medicinal cannabis was even stronger, with 77 per cent of respondents saying it should be permitted. A similar proportion said they would consider using cannabis-based treatments if there was strong evidence it would benefit them.

The Conservative Drug Policy Reform Group (CDPRG), which commissioned the poll, said the findings indicated “clear and growing appetite” for a new approach to drug policy in the UK.

“This survey shows the government and politicians are significantly behind the public’s thinking,” said Rob Wilson, the group’s chief executive and a former Tory minister for civil society.

He added: “It illustrates the widening gulf between the stubborn, decades-old policies of blanket prohibition and the developing attitude of millions of voters willing to apply new approaches focused on improving harm reduction and healthcare outcomes.”