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In a human cross-sectional study on 612 participants, smoking was associated with lower serum levels of vitamin D than non-smokers, with a dose-response pattern (Jiang et al., 2016)

All but one of the partner organizations listed on the site are vaping advocacy and tobacco harm reduction groups, in countries around the world, from Taiwan to Uganda to Poland

It's not all about caloric intake though - prolonged smoking is associated with a reduction in bone density as it affects the body's ability to absorb calcium

It makes it difficult to breathe and can cause a fever and cough with yellow, green or bloody mucus

Dimensions: 2394 x 3178 px | 20.3 x 26.9 cm | 8 x 10.6 inches | 300dpi

Hairy tongue can occur at any age but is more frequent in older age