Smoke overrated?

[Mobhack]

It's the number of arty pieces that contributes - so lots of cheap ones may also help the attacker if he wants lots of smoke.

Attack and assault missions result in possibly more smoke ammo being given out than e.g. meeting engagements. (A larger random number is used).

But as advised above - if the enemy is using a smoke screen, then simply drop HE on his side and pepper the hidden troops. One of the best uses for your MRL is splatting massed concentrated infantry caught advancing in the open. i.e. MRL are more of a defenders weapon than an assaulters.