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One could potentially do surveillance testing of hair from school shower drains, although attributing hair to individuals might be more complex.
Testing a hair sample would likely be more diagnostic of longterm smoking.A 12 yr old shouldn't be smoking cigars at weddings. Around here, smoking is banned in all restaurants and bars. This greatly reduces one's exposure to second hand smoke. For a teenager, I'd set the threshold for second hand smoke very low. Essentially any detectable Nicotine/Cotinine would indicate that the kid was either smoking, or hanging out with kids who were smoking which I would consider as equivalent. That is assuming the parents don't smoke. Riding in cars with smokers?