I quit cold turkey around 4 1/2 years ago.
The final straw, for me personally, was at a rock concert I attended. I still don't know who was playing. I was walking around taking beers out of peoples hands, I have no idea how I didn't get into a fist fight that night. When I left the concert, yes I was driving, I was actually throwing up out the opened door while leaving the parking lot. I got to the Freeway and decided I couldn't make it home. Parked behind a flashing caution roadsign and passed out. Was awoke by a CalTrans worker around 4:00 in the morning, then drove home.
I was 32 years old at the time, on my second marriage, and my wife was 8 months pregnant.
I wilingly stopped drinking the next morning, and haven't had a drop since.