Jenna has had serious drug and alcohol problems. And beaten them and has gone on to be a big success. Look there are tons of talented people in porn and sports (Chris Washburn, Taylor Rain, Anabel Chong, Tony Tubbs, Michael Ray Richardson, David Thompson) who couldn't lick their problems. Hell most "normal people" can't do it.
I have jumped on the Anti-Jenna wagon for lots of reasons, but give credit... she has exceeded all expectation and worked her ass off.