Tareyton Lights ads used a white streak under the eye. Always reminded me of “tanning bed eyes” that people get from wearing vision protecting goggles while tanning.
Activated charcoal is not carcinogenic, and commonly used in air and water filters.
Charcoal tablets (which is 98% charcoal and some binding agent) is also a common remedy for (traveler's) diarrhea, and perfectly safe for consumption. You can get it in any pharmacy over the counter.