Hello,Thanks for using Just Answer. My name is XXXXX XXXXX I will do whatever I can to answer your question.
You would have to touch a LOT of door knobs and put your fingers in your nose or mouth a LOT. An incidental touch is one thing. Doing it over and over and over again is using cocaine. You would recognize the difference.
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You're quite welcome. You would know the difference between a casual incident and continuous exposure. For one thing, continuous use would cause symptoms.