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How do they determine secondhand smoke related illnesses?

Asked by cheebdragon (20506points) January 12th, 2015 from iPhone

Lung cancer
Ischemic heart disease
Harmful effect on the cardiovascular system, increasing the chances of a heart attack
Strokes
Coronary heart diseases
Chronic obstructive pulmonary disease
Chest pain
Nasal sinus cancer
Chest pain
Throat cancer
Breast cancer

These are all things that people could get anyway, so how exactly do they determine that secondhand smoke is the cause? I’ve filled out plenty of medical forms in my life and never once have I seen or been asked the question “do you live with or spend time around people who smoke?”...
Where are they getting reports from to even determine these kinds of statistics?
It reminds me of “4 out of 10 women don’t report rape”...if they aren’t reporting, how could you possibly know that it happened?

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