Fear of lung cancer, heart disease, and high blood pressure may not be enough to motivate some people to quit smoking, but premature aging can be a powerful deterrent. Smokers tend to look older than non-smokers, and research helps explain why.
A study published in The Lancet (March 24, 2001; Volume 357, Pages 935–936) found that tobacco smoke increases levels of matrix metalloproteinase-1 (MMP-1) in the skin. MMP-1 is an enzyme that breaks down collagen, the structural protein responsible for skin strength and elasticity.
As collagen degrades, the skin loses firmness and resilience, leading to sagging and the formation of wrinkles. The researchers noted that this type of damage resembles scar formation and is largely irreversible, explaining why the aging effects of smoking persist even after quitting.
