For all the reasons stated in various posts above.
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But the point isnt what we already have now that is legal, it is whether it is appropriate to legalise a drug and increase its usage as a recreational drug.
I care not if an adult smokes, drinks or uses cannabis, but I do care whether it would be preferable to increase the likelihood of our children accessing it earlier, no good telling me that they already do, many do not and this would encourage greater accessibility and qualification to use it.
Do not make laws from the extremes, legislation that might help and would continue to help a current addicts or heavy users isnt the same as what would be preferable to introduce to the many.