Here’s a study about smoking and vitamin D metabolism:

The Influence of Smoking on Vitamin D Status and Calcium Metabolism. (1999) (Download)

Conclusion: This study evaluated 510 middle-aged women, 50% of whom were smokers, comparing the vitamin D levels and bone mineral densities between smokers and non-smokers. The smokers had lower vitamin D levels and lower bone mineral density compared to the non-smokers. “Smoking has a significant effect on calcium and vitamin D metabolism.”

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