Infected: Smoker

SMOKER: The Smoker is an Infected with a long, whip-like tongue that is hundreds of feet long. The Smoker's tongue can be launched out of its mouth at high speeds, and when it reaches one of the Survivors, it automatically wraps around their body and drags him/her back toward the Smoker. -The Left 4 Dead Wiki

SMOKER: The Smoker is an average sized boss infected covered in growths and boils and has a fifty foot long tongue as its primary weapon. He also releases clouds of smoke.

The Smoker's tongue is fired at the head of a Survivor and wraps around their neck. The Smoker can choke its victim from above by hanging them from its tongue. A choking Survivor is unable to move or attack until another Survivor rescues them. During its tongue attack, the Smoker is helpless, even if it misses. This attack has a cooldown. -Left 4 Dead 411

SMOKER: The Smoker, an infected that can ensnare survivors from a distance with its long tongue and, upon death, releases a cloud of smoke that obscures vision. The smoker is rare on most levels, and prefers higher locations to attack from, like on skyscrapers and ladders. -Wikipedia

A Smoker from "Left 4 Dead".