Of course, the battle has already been half-lost once you have a category "drugs".

Especially since the category itself is determined by governmental fiat. I once saw an ad for employment at Philip Morris with a footnote to the effect that Philip Morris is a "drug-free workplace". I'm sure they've plenty of nicotine and caffeine there, they're simply using 'drugs' to mean "things to which the federal government has already said 'boo'"