You're kidding me, right?
You... better than anyone... know that the next dip you stuff in your face could totally be the one that turns your life into a cancerous hell.
You wimped out in '12... what's different now? All the shit that "kept" you from quitting... can you handle that any better now? Dude, tomorrow always breeds another tomorrow. You just put yourself through 3 more years of slavery because of that mentality. Man up. Do it now. Quit... Right... Now. That... is true badass. You got it in you? Freedom waits m'man... you really want it?