Wanting to quit and hitting rock bottom are good motivators to quit, but they aren't necessary. Sometimes you need to so something for no other reason than it's the right thing to do.
Yesterday the addictive voice was in full swing to the point that I veered off the sidewalk toward the liquor store door and then against every bone in my body I said out loud "you are not doing this" and swerved back onto the sidewalk. I ended up having a wonderful, sober evening and feel stronger because if it.
Move past your need for desire and take the first steps.