I think you guys start to understand where i am comming to
Yeah! You saw a yellow gas and thought "this must be deadly". Right, do you know anything about "Placebo effect" ? It's something like that: doctor says "take this pill and you'll be ok" and then you took the pill and you get better. But the pill is a fake medicine, it's just a candy. Candies can't heal your sickness. The gas! the gas is just "Placebo" it's a fake gas.
Yes, my children, i can hear you saying "But it hurts, why does it hurt if it's a fake gas?" because you think it's a harmful gas my child. It's only on your mind. Pain is only on your mind. Did you ever see someone died because of Smoke's gas ? Well my answer is no. Because killing with a fake gas is not possible. And for God's sake think about it a moment. What would you do if you get a perfect formula.