It does seem a bit daft having establishments called "drugstores" where people can't buy legal drugs - but then "drugstores" in the States have always been very different animals from chemists or pharmacies (or apothecaries) in the Old World - at any rate the ones they have in teen movies don't bear any resemblance at all.

And am I correct in understanding they in any case these drugstores don't sell the other main legal drug in current use, alcohol?