If you're looking for a weapon that can produce smoke, then you're in the right place. Gun Smoke (Weapon muzzle smoke and Smoke Trails mod offers you weapons that now create smoke when they are fired, with various smoke effects for each type of weapon. For example, pistol muzzle smoke is much smaller than rifle muzzle smoke.

This mod was an attempt to create a New Atmosphere for gun fights in fallout 4. Along with all the other particle effects in vanilla FO4, smoke released from muzzles now blows in the direction of the wind. Muzzle smoke now depends on the surrounding area and its lighting conditions, however since the lighting system is not flawless, smoke may appear overly bright in dimly lit locations.