I suppose that the real question is in what context these smokers are being sought. If its the ministry trying to find them, then I'm sure they have methods of testing for copper burners (for which some very clever tricks have been proposed).
Consider, though, that you're a skaa smoker, like Clubs. Immediately you'd know something was up (call it "Luck", call it that tingly feeling I get when we use the nice, copper tankards) and would probably burn copper without knowing it, much like Vin did. Also much like Vin, you'd probably have to tell the right people about that feeling, who might direct you towards someone knowledgable (a Kelsier, if you will) to test you for various metals.
Another thing to consider though is people like Duralumin and Aluminum gnats who can only burn enhancement metals. they never get found out because there's nothing they can really do with their abilities. It may well be that there are a lot of smokers who just don't get discovered, along with all the other Mistings with metals that just don't stand alone.