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Do the joker gas weapons and the green goblin gas weapons have any affect on each others?

I dont know what you mean. The Joker gas kills you with laughter, the GG gas gives you augmented strenght, agility, speed, etc. The insanity is a side effect of GG's gas.

i dont think the joker can get any more insane, but that be cool seeing him with super strengh and stuff.

I agree. Joker seems to kind of be immune to certain toxins and such, so the goblin formula probably wouldn't do anything except make him more deadly. Then Batman has a serious knife in his side.

Only the insane are immune to Joker's gas, or if they are immune to poisin or whatnot

Joker's gas even affects most Arkham inmates, I believe...