Probably not a good idea.
Even though the law does not
specifically prohibit consumption of alcohol while OC'ing, I'd be very careful.
Let's play "What if": You are at a buddy's house, and you have 2 beers while you are there, and you leave. You are not tipsy, and you have the utmost confidence in your ability to drive. You stop at the gas station on your way home, and have the unfortunate experience of being in the wrong place at the wrong time during a holdup. You deploy your weapon in self-defence, shooting the robber. Lets say you shot him more than once. We'll call it a double-tap. Then one of the officers on the scene happens to smell alcohol on you. If the DA has a bug up his butt about citizens with guns, he might try to push the issue of there being alcohol in your system, impairing your judgement.
We know that this would be a load of BS, but it could make things much more difficult for you if he wants to haul you in front of a grand jury.
Regarding CC, it is not just illegal to consume alcohol while carrying, but to carry while there is still alcohol in your system.
It is unlawful for the permittee to carry a concealed handgun while consuming alcohol, or at any time while the permittee has remaining in his or her body, any alcohol, or a controlled substance previously consumed. N.C. Gen. Stat. § 14-415.11(c)
Personally, the only time I consume alcohol these days is at home, and only when I have no plans to leave any time soon. I don't think anyone really cares if I carry (open OR concealed)
inside my home while I'm downing a beer