If you parse the actual words the Fat Man spoke, you'll notice he cut himself quite a wide swath of slack.
"I do not use crack cocaine... I am not addicted to crack cocaine."
As has been widely pointed out by now, that's quite a bit different than saying you never used crack cocaine.
But what about this focus on crack cocaine?
Sounds to me like he has pretty much admitted to using the old-school powdered stuff all day long! Hell, he might even be addicted to it!