Sensitive folk here. Chill out, smoke one, or two. By "headshots", what do you mean you're about to have them taken? Like an x-ray or something? Or you've been punched in the head a lot?

Anyways...I have never seen, or heard of this. My dad is 53, been smoking (weed) since '72, no dark lips. I know plenty of people who've been smoking for over 10yrs who don't have dark lips. It's not something I would worry about, who cares if your lips are darker. Slap on some chap-stick.