Somebody, somewhere, may begin to take such suggestions seriously one day.
Most libertarians have for a long time stated that the sale, use and possession of all drugs ought to be decriminalised. You can go either on the absolute objectivist argument that a human being’s body is his/her own, not to be interfered with by Statists. Or you can merely refer to the increased order and social utility gained by not having all the associated secomdary crime that surrounds the illicit dealing and supply of drugs at very high prices.
It is most unlikely that the UK’s political parties will be advocating anything like this any time soon. The generalised Puritan-Enemy-Class view of “drugs”, and indeed any other way of gaining simple individual or group enjoyment such as beer or wine or sex, still lies too far to the fascist Left for quick change.