I think that's a bad idea. Eat out of one of them, and they will be just as "odorous" as anything else you have.
If you wash the bags with soap carefully, rinse thoroughly, and then air dry them for an extended period of time, then OK, maybe... but you can't easily do that at a campsite.
In my experience -- and I babied my bags and didn't eat out of them at all -- these bags can give out after using just a few times. In fact, I highly recommend that you bring 1-2 extras on your trips. And don't use them as cooking containers.