Besides many known health risk implications of smoking there is also the aging factor.
The study on identical twins showed that each 10 year of smoking translated to 2 years of additional perceived aging.
From the study Factors contributing to the facial aging of identical twins
One of the strongest associations with perceived age was whether a person smoked: every 10 years of smoking was associated with a 2-year older appearance.
{max-width: 500px, display: block, margin: 0 auto}
{max-width: 500px, display: block, margin: 0 auto}