turn smoke off indefinatly?

[wicked]

Is there any way to turn off the smoke and to clear hexes for good? I know you can press the c key to clear hexes but it comes back on when a new smoke,fire, dust etc is made. Can be annoying when in the desert and every time a vehicle drives it turns it back on again and in the enemys turn it can be hard to see what's going on when the smoke etc is showing.
Cheers dylan