Smoker

The Smoker is one the cameo Monsters from the videogame Left 4 Dead that appears during the movie, along with the Boomer, Charger, Tank and the Witch.

It was placed here because the directors originally planned to release Left 4 Dead exclusive DLC maps that featured the Cabin and the Facility. This idea was eventually scrapped when the company producing the DLC went bankrupt

Physical Description and Attributes
The Smoker has been heavily mutated by a strain of the Green Flu and frequently makes high-pitched rasping and coughing noises. His skin has become covered in growths that cause little spurts of green smoke and blood to ooze out when injured It is said that the smoke he expels gives off a putrid smell, but it is otherwise harmless. The left side of his face is bloated and appears to be covered by a large tumor. His most noticeable features is his tongue which has also been horribly mutated, so much as it seems to have grown and protruded from the back of his head and is extremely longer than a normal human's.

Its possible a vile of Boomer Bile could be used to summon the Smoker from the Cabin's Cellar.

Appearances
The Smoker does not appear in the film. Many viewers claim to just barely see the Smoker from out of view as the camera pans-out in the Elevator Scene, but this has not been confirmed yet.