OK, so... there are a couple of Gear items that reduce setbacks for Mist and Smoke.
There are no Smoke Grenades in the Gear lists that I have found.
There is the InstaMist generator.
Stormtroopers wear helmets.
Would it be fair to rule that a Smoke grenade exists (having never seen anything like it in the Films, besides R2 on Cloud City in ESB), and that Stormtroopers helmets provide the same 'smoke penetrating features' that some of the other goggles have?
(If so, what stats would you provide to the grenade? Clearly, it would be non lethal, and clearly Threat/Despair, could have wind effects negate it, or reduce the time it is effective etc)
Basically... it gives the Troopers some kind of masking effect while attacking, that they can mitigate to some degree, that potentially the players cannot, unless they have the right gear?
Or is that just GM Engineering to make life difficult?