The tar creature. Once you allow it access, it begins its work from the inside out. Black as night, but clear as day. It clings to the lungs like a parasite, and from there on, crawls upwards through the esophagus until reaching the exterior and turning the victim into something they're not. Its face replaces that of its host, hiding the person underneath with a monstrous facade.
So this is my entry for the 'Make Ugly Contest'. I'm almost definitely not going to win. But hey, just entering has got its perks. You get more exposure and it's also fun. So yeah.
There's probably a whole bunch of mistakes in this because i'm an amateur. See if you can find them all.
Hope you like it.
(BTW, this isn't meant to be an attack on anyone who does smoke. My grandpa smokes and he's, like, the most epic elderly dude ever. He still works on Texas oil rigs and whatnot. This is just what the contest prompt called for.)