More than sun exposure, smoking causes wrinkles at an early stage for smokers compared to non-smokers. Smoking causes changes in the composition of the skin, causing premature ageing. Based on scientific studies, the skin loses its elasticity and acquires small red lines due to the dilation of blood vessels. The more you smoke, the more your skin ages.
Serious damage cannot truly be undone without surgical options, but rapid improvement in many problems can be seen relatively quickly once smoking has been ceased.
Consult your local dermatologic surgeon for options to counteract any serious damage.