Quoted from Mfsrc791:Sometime me and my buddies will blow e-cigarette smoke in front of the other players game. It's pretty effective.
It also makes me think how cool it would be if the game would do that as a special effect to make things harder. Would be a pretty cool gimmick
Someone has done that:
https://pinside.com/pinball/forum/topic/review-of-the-smokefogger-mod-for-my-bsd