Thank you A Reg, most interesting. The issue of not taking ones medication affected one of the young people I mentioned on my earlier post. He often neglected to take his tablets and smoked cannabis instead. The result was very bad. At one point, he was found by police in the middle of an 'A' road trying to 'exterminate the aliens' (ie confronting approaching vehicles travelling at speed). He also tried to jump from a high wall, but a passer-by grabbed him. None of this is in the least funny or clever, just very sad indeed. He had been perfectly normal until his late teens, when the drug-taking began.