Fantastic idea Flip Flop
You forgot to mention the need for us all to check how long that GPs prescription drug stays in the bloodstream for before travelling. You know, allow 3 weeks for codeine, 4 for a muscle injury needing a steroid injection - that sort of thing. Of course if they start hair follicle testing, well you'll be going back years on that one.
Of course we would now be wise to look up the worlds regimes of whats allowed and where, might take a medical degree, an understanding of latin, knowledge of drug variants just in case.
Best also tell all the professional flyers out there to stay of the old Ephedrine (Vicks and similar to you and I). That'll get you busted in the odd country or three as well.
And as for standing near anyone smoking something of dubious origin - well a certain athlete seemed to have had a problem the other day with that one.