in recovery(In the addiction field, the term has been used in a third way in 12-step programs. There, it is traditional for people to refer to themselves as "in recovery," no matter how long they have been abstinent from their addictive behavior and no matter how well they are doing in life. AKarp)
I'm on the wagon(on the wagon: in or into a state of abstaining from alcoholic beverages; opposite: "off the wagon" – in or into a state of no longer abstaining from alcoholic beverages: ‘And yet, he's a former alcoholic who's been on the wagon for 12 years.'geo777)