Drinking definitely affected my work performance, but not the quality of my work. I just did less of it because I'd never do anything I'd think I'd botch and a lot of the time I just wasn't up to working. I totally did the tripping over my tongue thing when talking to clients though and I found it really embarrassing, even though I'm not the most eloquent of people anyway. Basically my performance just went downhill the longer I drank. I was lucky I didn't have to take time off for recovery...I think if I left it longer I would have done.