Inhaled Poison Question

[Scrynor]

I've been reading up on all the places I can find about the real way poison works (Hurrah, Jason Bulmahn!) but I still have a few key questions:

1) How long does an inhaled poison last?
2) Is there any cloud or obscuring effect on inhaled poisons? Is the cloud visible but has no negative effects on vision? Is it invisible?
3) It says you can be exposed to multiple inhaled poison doses at once. If I throw 3 vials of the same poison in one turn at a guys feet is that exposing to 3 doses at once (1 harder save) for when he breaths in or is it 3 normal saves as each vial breaks?
4) Is throwing an inhaled poison considered a splash weapon for stuff like splash weapon mastery?

Bonus Question: They say similar but different poisons are tracked separately and list the same poison but with different base DCs as an example. What about identical poisons but of different forms? So say the same poison but you've made one an injury and one an inhaled?

[Scrynor]

Hmm, no answers. I'll take my guesses and maybe other people can say if that is how they play it too?

1) 1 round (all other poisons are one-offs so why not this one? It seems weird because they talk about suffocating but maybe that is just in case someone continually throws them?)
2) Visible, no obscuring
3) 1 big save
4) ...Yes?
B) Same poison, not different

[zengardener0]

It seems that inhaled poisons must linger.
There is so much text about staying in the area, holding one's breath, and possibly suffocating from trying to hold one's breath. Why bother?