Fog, smoke and concealment

[Rogue problem]

I am confused how smoke works for concealing you and your opponent in battle. Say there is a 10ft cube of smoke. My opponent is next to me 10ft from the smoke and I am right next to the smoke but not in it, 5' away. If I 5 foot step back into the smoke do then have just concealment from my opponent? And does he then have concealment from me since I am looking through smoke? Now say I step another 5 feet back deeper into the smoke. Do I now have total concealment from him? Can I see him being that he is not surrounded in smoke even though there is 5 feet of smoke in the space between us. Would he then have concealment from me or total concealment or no concealment? I guess what I'm asking is if the smoke space I occupy counts against my own visability.

 

[frankthedm]

Ranged: Maybe... Depends on the undefined defintion of boarders in the grid system of the D&D game.


Melee: no.

Concealment

To determine whether your target has concealment from your ranged attack, choose a corner of your square. If any line from this corner to any corner of the target’s square passes through a square or border that provides concealment, the target has concealment.

When making a melee attack against an adjacent target, your target has concealment if his space is entirely within an effect that grants concealment. When making a melee attack against a target that isn’t adjacent to you use the rules for determining concealment from ranged attacks.