it has been discussed before. the fact that many wood pallets are treated to prevent bugs and also the fact that they could have had some kind of chemical on them. I personally would not use them unless you know exactly where they came from and what was on them.many pallets are used and reused and theres no telling what they could have been exposed to.
Not a stupid question at all. In fact, a very good one as I'm sure many on here would think that they would make ideal pieces to burn in a smoker. But just like uncle_lar said, you don't know what they have been exposed to. I can tell you first hand, that when I was a forklift operator, pallets sat in all kinds of nasty stuff, were always having something spilled on them when loading drum and so on. If you can get them, they are a good cheap firewood to have around for a firering, but thats all I would use them for, unless your are postive they have not been exposed to sone nasty chemicals.
There's never a dumb question because we have all been there done that and some even saved the shirt (I did) but pallet are definetly abondent but like most have said I wouldn't use them because you don't know where they have been or what was don't to it.
I have used oak from a pallet factory. It was the cut ends and never was part of the pallet itself so no worries about chemicals on the wood. If you have a factory that makes the pallets it can be a good source for wood.