The Institute of Economic Affairs has seriously undervalued the size of the UK marijuana market in their paper on tax profits in a regulated market ( Legalising marijuana might be’ win-win-win’ for UK, states thinktank, 29 June).

Information from our 30,000 survey participants shows typical yearly usage to be 423g instead of the report’s 82.5 g, which would put the quantity used by 3 million people at 1,270 tonnes rather than the IEA’s 255 tonnes. This would value the UK market at near to ₤ 10bn.

This underestimation brings the threat that when post-regulation sales reach our quotes it will be condemned as a big increase in use rather than acknowledged as unveiling the true level.

The proof from abroad recommends increases in post-legalisation use tend to take place among older age groups, staying steady or perhaps declining among teens and young adults.Matthew J Atha Director, Independent Drug Monitoring Unit; author of Taxing The UK Cannabis Market( 2011) – John Keane raises the problem

of the morality of using drugs, considering the horrors of the trade( Drug users, take responsibility for the harm that you trigger, Letters, 28 June). I assume he has actually never owned, for instance, an Apple item. And there’s no chance an ethical consumer like him drives a vehicle or has more than two children. I would also presume therefore that he does not consume coffee or alcohol or, if he does, he makes certain his choice of item is– in every method– fairly noise. The point ought to be apparent, that concentrating on the specific consumer is not an effective strategy when dealt with by oppression and oppression that is systemic– this is a problem with international capitalism usually and not simply the drugs trade. Mr Keane is on the ideal track but doesn’t cast his net large enough. Do I have a solution? Perhaps not, but ethical industrialism

is an impression and Keane should be wary of this line of thinking.Josh Kerr Guildford, Surrey – Sign up with the dispute– email [email protected]!.?.! – Learn more Guardian letters– click here to go to< a href="” title=”" class=” u-underline” > Subjects Cannabis Drugs< a class

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