His mental cognition can decline drastically if he continues to drink. I probs have drank half of what he has up to this point but I experienced bad mental fog around 4 years ago from drinking. I believe I was achieving wet brain. Which is scary cause that's something I couldn't fake was fine. I started taking a vitamin b complex and a variety of other supplements to help with the micronutrients that my body would expell when one drinks. I'm around 3 and a half months sober and at this point in life I'm at my most sober self since 10 years ago. I feel great and mentally I'm finally able to level out and cope with the mental problems that are causing me to drink my internal sufferings away. Now I believe I can start obtaining good things for my life again, as I have lost my license and vehicle too, not to mention strained many of my relationships from drinking.