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Air pollution, toxins, heavy metals and smoking each result in lower Vitamin D levels – Nov 2018 | VitaminDWiki
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vitamin d: Men's Health Week: From vitamin D to magnesium, supplements that males need after 40 - The Economic Times
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Air pollution, environmental chemicals, and smoking may trigger vitamin D deficiency: Evidence and potential mechanisms - ScienceDirect
Tobacco smoke exposure is an independent predictor of vitamin D deficiency in US children | PLOS ONE
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