Well from my experience anytime you have a fan involved, your going to have little flucutation with temp. because not all units are sealed static tight. As long as the temp doesn't go haywire on you then your fine. I have the Vapir ONE and it works just fine with the temp. flucuating. because it only flucuates a 10degrees up or down.

The best way to breath is slow and steady but it really depends on what you are vaporizing as well. On my Vapir ONE I have the option to either direct inhale from the unit or inflate vapor balloons as well. So it all depends on what you are vaporizing and from what too.