I'm not arguing that drugs should be legal, but we do have to be clear that the reasons for banning them and the punishment are not necessarily rational.
Personally I'm in favour of further narcotics legalisation, but with regulation to manage it's social effects and taxation to fund the expensive mitigation measures it would require.
Why is it legal to drive a car, then?
> You can't do whatever you want with your body
is pretty reasonable, but how about we rephrase it as something like:
> You can't do something with your body that significantly increases the risk of harming others
?
The recent change in policy simply reflects the prevailing trend of reducing disparities in sentencing for criminals while increasing disparities in crime victimization by failing to enforce the law.