Well.. I'm not one to throw stones cause in my teens we used to drink & drive all the time.
This was back before the whole 'MADD' uprise about drinking and driving so we didn't really give it a second thought. I think back now and realize how close I came to killing myself on numerous occasions. Falling asleep at the wheel on the highway. Being so drunk I had to keep one eye closed because I was seeing double. Spinning my car 180 deg into the oncoming traffic and going backwards down the embankment...twice.
Smashing the rear view mirror off my car because I swerved into incoming traffic... getting up in the morning and wondering who had moved my car and then realizing it was me,...I just couldn't remember going out.
If you counted smoking pot or doing other drugs while touring, you're talking about driving wasted nightly for 10 years or more.

The thing that finally stopped me was getting pulled over many years ago. I was 'this' close to falling asleep at the wheel when the cop pulled me over.
I blew something like double the limit.
Thing was though, I got off easy and was really grateful for getting pulled over that night cause I probably wouldn't have made it home.
Instead, all I got was a ride home by the cop, a $300 fine and a 30 day suspension.

Now of course... the brain cells kick in and I realize how utterly stupid I was.
There's no way I'd chance it anymore.