From Lexicanum

Smoke Launchers are used by all Imperial forces and the Chaos Space Marines as a vehicle upgrade. They are effectively small grenade launchers mounted to the front of vehicles loaded with smoke charges. They temporarily hide the vehicle behind a wall of smoke and is useful for providing cover, especially when the vehicle is out in the open.

Sources

• Warhammer 40,000: Wargear
• Codex: Imperial Guard (3rd Edition, 1st Codex)
• Codex: Imperial Guard (3rd Edition, 2nd Codex)
• Codex: Space Marines (4th Edition)
• Codex: Daemonhunters (3rd Edition)
• Codex: Witch Hunters (3rd Edition)

Related Articles

• Imperial Guard Vehicle Upgrades
• Space Marine Armoury
• Witch Hunters Armoury
• Daemonhunters Armoury