Britain’s top drug adviser was fired Friday after saying that marijuana, Ecstasy and LSD were less dangerous than alcohol.

David Nutt’s comments have embarrassed the British government, which toughened the penalties for possessing marijuana earlier this year over the protests of many prominent British scientists.

Nutt said he was disappointed by his sacking, telling Sky News television that it might have something to do with the upcoming general election, which must be called by the middle of next year.

“Politics is politics and science is science, and there’s a bit of a tension between them sometime,” he told the broadcaster by telephone.

In later comments to BBC radio’s “PM” program, Nutt accused British Prime Minister Gordon Brown of making “completely irrational statements” about the dangerousness of marijuana.

“I’m not prepared to mislead the public about the harmfulness of drugs like cannabis and Ecstasy,” he said.

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