casually say "im feeling a bit ill,how are you/? " if they reply, "im not so good as it happens" and then go on to tell you a minor medical problem,you should feign sympathy and if they then go on into more detail ,they are testing you to see if youre a sucker for a sob story . this type is a professional lead-swinger and worse than useless when the going gets tuff
another question to ask is "do u smoke/?" , if they reply, "what,cigarettes/? " they are dope smokers , avoid like the plague is good advice