In all seriousness, I am against the death penalty but why are they not using Helium?

I mean, the cheapest, most painless and effective method is Helium, as far as we know.

Lights out without feeling anything, within seconds.

I am against the death penalty, I have my reasons, but if they are going to do it anyway, why not Helium?

Why the complicated drug cocktail or other methods that have a much higher chance of causing prolonged suffering and even failures?

Again, this is a scientific and moral question, I am ABSOLUTELY against the death penalty.