Cross-sectional study finds a link between secondhand smoke exposure and depression symptoms in non-smoking adults, suggesting indoor environments may play a role.
The authors have each completed and submitted an ICMJE form for disclosure of potential conflicts of interest. The authors declare that they have no competing interests, financial or otherwise, related to the current work. F. Meng reports that since the initial planning of the work, the present manuscript received funding paid to the institution from the National Key Research and Development Program of China.
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