Yes
my RABF had horrible, constant diarrhea throughout the day, with bleeding and hemmorhoids, and also has reflux from burning his gut from throat to butt! Since quitting, though, stools are healthy and rock-hard.
This is one of the reasons, I think, that alcoholics become so malnourished: everything is pooped out, and the intestines lose their ability to absorb the good stuff we need to be healthy.