4 weeks post-op T junction breast reduction. Have had an open wound, when will it heal? (photo)

4 weeks post op, and had quit smoking a week prior to surgery. My PS was aware that I had quit a week before, and haven’t smoked besides 1cigarette a couple nights ago. The area isn’t red or inflamed, little pain and every time I remove the gauze, there is a dark dark red blood. This has been around for about two weeks, i’m just curious of how long it is going to take to heal, and will my one cigarette affect this wound?