Here are a few steps on how to lighten lips stained from cigarettes:
Moisturize your lips with products which contain either shea butter, cocoa butter or almond oil.
Use Sunblock lip balm or lipstick with a SPF20 or greater factor.
Quit Smoking as this is the main cause of the darkening of your lips.
Massage your lips with almond oil, which can increase blood flow and brighten lips.
Exfoliate your lips with a sugar scrub to remove dead skin.
Use a pomegranate lip scrub as this can make your lips pinker.
You can use lemon juice or potatoes or beetroot juice, pomegranate lip stain.