Re: Raise more Tax
He would then have needed to invest the same amount in the Emergency Health service who would treat accidents caused by such an act of tom foolery.
You make a couple of rather grand assumptions there, and I don't think they hold much water:
1) That there are currently no cannabis users in the UK.
2) That cannabis use frequently leads to hospital admissions.
3) That if cannabis use were legalised, non-users would suddenly start using it, or that users would suddenly up their intake.
The truth of the matter is that 1 in 3 UK adults has at some point taken illicit drugs (these are most likely to have been cannabis, simply due to its availability, and fact that you can smoke it and don't have to snort or inject it). It is estimated that 5% of the UK population regularly uses cannabis - that's 3 million people, give-or-take. Hospital admissions related to cannabis use are not great in number, and are rarely expensive emergency admissions; the most likely admission is to a mental health unit due to acute psychosis, as some people react badly to cannabinoids.
From a personal point of view, I know a number of people who either have, or still do regularly smoke cannabis. I've never personally heard of a single hospital admission related to cannabis use. I do know people who have had mental health episodes which are caused by stress. On the whole, these have not been amongst people who use cannabis.
Just as a final point, I'd better mention that I obviously don't advocate the use of any illegal drugs. Although I believe that there should be more of an element of personal choice about what we can put in our own bodies, we also have to take responsibility of our actions when we do so, and the health costs that may result. This also applies to drugs which are currently legal (such as alcohol, tobacco, and caffeine), some of which could well be much more harmful than cannabis, both to individuals, and to society as a whole.