You certinly shouldnt tell the truth.. but they wont be looking for drugs, hell, if you go in for a cold they wont even take blood... the doctor will listen to you breathe, look in you ears, nose, and mouth.. you will then be given an anti-biodic that you certinly don't need...
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"I am not one of those weak-spirited, sappy Americans who want to be liked by all the people around them. I don't care if people hate my guts; I assume most of them do. The important question is: 'What are they in a position to do about it?'" (William S. Burroughs)