- Smoking habits not only have an impact on the health of the body, but also on the appearance of the lips. - The nicotine and tar in cigarettes can cause lips to darken, dry out, and lose their natural moisture. - Here are five of the best lip serum recommendations that can help brighten dark lips while maintaining moisture. Suara.com - Smoking habits not only have an impact on the health of the body, but also on the appearance of the lips. The nicotine and tar in cigarettes can cause lips to darken, dry out, and lose their natural moisture. As a result, the lips look dull and it is difficult to return to their original color. To restore the natural color of the lips, treatment with a lip s... [Read more]