Interesting..........didn't realize there was plastidip smoke for tail lights.
Yes, there is and it is very odd to spray. After 3-4 coats it barely looks noticeable. Let it sit for 20-30 min and you see it darken. After that 3-4 coats let it dry so you don't make it darker than you want it. We used 6 coats on the Yukon we did and it finally got dark enough for the owner.