Head Canon
Mickey never really quits smoking, though after him and Ian had married and moved to the west side his cigerette intake is 1; maybe 2 a day. Ian gushes about how ‘ proud ‘ he is since his red headed husband had stopped all besides the occasional social smoke. He doesn’t cut down for any reason than he doesn’t have the time or feel the need.
Being married have given his hands new things to make themselves busy. From fidgeting with his wedding ring to stealing Ian’s hand. His stress is severely less considering he’d out of prison, Terry is dead, and he’s married to the only person he wants.
So occasionally if he’s waiting on a run, or wakes up too early he’ll pull out the worn pack from his jacket pocket. Though nothing in comparison to how many he’d smoked in the past.