Well, no:

One day – and I don’t, I hope, say this fancifully – politicians will
credit the moral intelligence of the general public, and their own
integrity, enough, to stand up and say: "I took drugs. And I loved it."
After that, a proper conversation can start.

I don’t think that this is actually true. As someone who has indeed taken drugs and one who genuinely didn’t actually like those tried, I beg to differ.

Every human society has had a method of getting blitzed, something socially accepted as a way of blotting out the horrors of the universe. In various places and at various times it’s been booze, pot, opium, ecstasy, dancing, religious fervour, (even, combining the two, dancing in a church with a poisonous snake in your hand, something remarkably foolish by any standards), peyote, munching grubs growing in agave plants, no doubt out there there has been one that used sex and possibly even one that recommended the tooting of rotten whale livers.

But the point is that here in a liberal society, one in which we are indeed owners of ourselves, we no longer need nor desire just the one approved method. If you want it in economic terms, everyone’s utility function is different:  that is, I think, the great insight, the definition of what it is to be a liberal.

So there’s absolutely no contradiction at all in my saying that I smoked dope and didn’t enjoy it ( I’m entirely capable of being boring without chemical assistance, as some 10,000 plus posts here show) but that the law should be that those who do enjoy it should be allowed to smoke it. As those who do not enjoy alcohol (or tobacco) should allow me the freedom to ingest my drugs of choice.

Not, "I took drugs and I loved it", but "each to their own".