There have been a lot, but the two most recent ones that have popped up are
I don't have any responsibilities right now so why not?
It's been a long time, the damage I did has healed and so It's okay to start up again.
Drinking and using drugs never caused problems, it was the lack of sleep due to going to bed drunk and stoned all the time. If I take extra naps and take a few days off in between I'll be just fine.