So, let's say my character is wearing smoked goggles and uses a reach spell to heal someone. Does he suffer concealment miss chance?
Or let's say someone is blurred or invisible. Do you have to roll concealment miss chance to heal them?
Concealment only matters if an attack roll is involved (basically). If you're casting a reach cure spell, the only things that matter are line of sight and line of effect. As long as you can see the target, and you can draw an unbroken line from your square to theirs, then you can cast the spell. Otherwise, the spell fails.
Concealment doesn't necessarily mean that you can't see the target, just that they are obscured somehow. If someone is blurred, it's harder to hit them, but you can still clearly see them to target them with a spell (unless it involves an attack roll). You can't see an invisible creature at all in order to target them with a spell. You'd have to correctly guess what square they're in and hope it works, unless you have true seeing or see invisibility.