I noticed that Home Depot and Lowes sells red oak for home projects. I've used it for things around the house. Could this wood be used for smoking. I don't think it's been treated with anything.
If it hasn't been treated it'll be fine, but if it's been kiln-dried it might have a lower moisture content than air-dried wood which might mean less flavor. I use kiln-dried scraps from a local woodworking shop and usually soak them in water for awhile before putting them on the fire.
It is probably all right to do this, but unless you can confirm that there were no chemicals used in the processing of the wood, I wouldn't do it. Plus, I would imagine that this would be one of the most expensive ways to acquire smoke wood.
I use wood scraps from projects I make. Some people work around wood and scraps are free. Myself I don't use red oak when I have white oak around. Not a whole lot of other species used in construction that is suitable for smoking though.