For the Mayo Clinic:

Thirdhand smoke is as dangerous as active smoking, according to anti-smoking researchers at the University of California, Riverside.

The reason for the failure of these researchers to disclose their past relationships with the tobacco industry is not entirely clear, but may revolve around their interpretation of the conflict of interest disclosure form's requirements. In section 3 of the form, authors of articles are asked to disclose any financial relationships with industry that occurred within the past three years. However, neither of the two co-authors has received money from any tobacco companies since 2010.

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