This is so familiar to those of us with parents, relatives or friends who grew up in the Sixties and Seventies. Whatever language they use, whatever caveats they issue, there's always a little figure hovering over their shoulder whispering like Danny the drug dealer in Withnail and I: "Hey man, you know, dope, weed, whatever you kids call it these days, is only illegal because of some stuff that went down with big corporations way back, it's not as bad for you as alcohol, it's harmless, yeah?"