No. Its a bad habit. Shows a lack of discipline. Its also a downer so as your buzz wears off so will your work ethic. Before you know it you'll NEED a drink before work which will ultimately bring you into the dumps and assist in your destruction. Physical dependency on liquor is a very terrible vice. What kind of so called pro boxer wants to knowingly give himself a substance abuse addiciton. If you hate your line of work maybe you should study another trade that you can enjoy without getting zooted on intoxicants.
Its so demonic, friend.
Oscar de la Hoya was an alcoholic when he was a pro.
And that's just one modern example. Jake Lamotta used to drink vodka before his roadwork in the morning.
One thing you've got to understand is most people that get into boxing are demonic individuals. And it's a well known fact that boxers party the hardest. You need to do some research friend.