The inner workings of the human body holds no mysteries for Lucifer. And if he wants to make bad jokes about it, than that's his prerogative.

Now that Dr. Paranoia over there has shut up and sat down and Iman is paying attention to him instead of the Devil, Lucifer can go right back to drinking until his liver enzymes aren't able to keep up. And considering that he's got some pretty impressive liver function going on right now, he's still got some serious progress to make in killing the rest of the alcohol in this bar.

Which he is going to make with a methodical, almost mechanical efficiency. Alcohol goes in the glass, alcohol goes down the throat. Rinse and repeat, until he has to wiggle his fingers at another bottle.