Alcohol reduces the ability to do many things, while at the same time increases your belief that you can do more than normal. That is why it is illegal to drink and drive in most Countries all over the World.
You push limits and boundaries, and it makes you feel Superhuman, which is never good and causes many accidents and mistakes, Poker was once referred to as a game which is won by the player who makes the fewest mistakes, and in my experience is very true.
I used to drink while playing Poker, and it never went well, you tend to make stupid calls, when you should be folding, and it is so easy with a two color normal deck, to miss or think you have made a flush or not.
I love to play against drunks, as they are very hard to read, but incapable to change their habits and will
bluff, bluff, and bluff again even when you are holding the nuts, all you need to do is wait and be patient until you have them drawing dead.
When the fun Stops, STOP!