[Griefbringer]

Yep, in the game the smoke ammo cannot start fires. In real life it sometimes can, though: when I was in military on one exercise a smoke canister chucked by one officer started a small fire in a dry forest - luckily some guys in my squad quickly spotted it and managed to extinguish it.

However, most HE rounds of any significant size can start fires: mortar and artillery shells, tank main gun rounds, RPG/bazooka/recoilless rifle rounds, satchel charges and so on.

Also, don't really expect the fire to drive away any dug in enemy - though it can cause pinning.

Griefbringer