"Well, everybody seen players getting big, hitting the ball harder, home runs and stuff. All of a sudden - boom -- they got the big contract and everybody's like, 'You know what, did that, it worked for him, why not do it?' . . . I mean, how can I explain this? It's like if you're going to race cars, if you're going to race a car and some people are using nitro in the fuel [Lopez laughed], and you see them winning all the time, and you're using regular gas - you know what? If they're using nitro and they've been winning, well, I'd be stupid enough not to use nitro, too."
The interview is here - he actually comes off very down to earth - and has some great stories on catching with the Braves.