Smokers photographed alongside their non-smoking twins

This twin is a smoker

Her twin sister is also a smoker, but she smoked 17 years less than her sister

This twin smoked 14 years less than his brother

This twin smoked 14 years more than his brother

This woman has never smoked in her life

Her twin sister smoked for 16 years and has had a lot of sun exposure

This woman smokes half a pack of cigarettes a day and has had a lot of sun exposure

This twin has also had a lot of sun exposure but has never smoked in her life

The face of a woman who smokes three cigarettes a day

Her twin sister who doesn’t smoke

A woman who doesn’t smoke

Her twin sister is a big smoker

This woman doesn’t smoke

Her twin sister has smoked for several years and has bags under her eyes and quite a wrinkly mouth

This woman doesn’t smoke but her twin sister does

A smoker with bags under her eyes and looser cheeks