I believe Pettite, that he only used it a couple times. Clemens on the other hand looks like he abused it.
I used a HGH supplement drink one time back in my freshman year of college. I knew at least 9-10 guys through my college career that used steroids. It wasn't that big of deal.
I did use creatine all the time though. We're talking small time college baseball here, the guys I knew broke the bank to buy that stuff. These major leaguers had all the money, technology, etc at their disposal and like it was with me it was just known that some people did it and never really mattered, it was accepted.
To say what they have been saying on ESPN all week it was culture and it will still go on in some colleges because the lack of funds to give a whole athletic teams the ability to do drug tests.