I had my right kidney removed recently.  I was a heavy smoker (pack to pack and a half a day)but stopped smoking 1 day before surgery.   After returning home to recover in a very stressful environment, I found myself relapsing at least puffing ona  cigarette everyday, but not smoking the entire cig.  I am so scared I am failing at taking care of my one kidney.  Can someone please shed some light on this topic.  My left kidney is fine but I know at some point in the near near future, I have to cut the cigs out all together.  Am I already screwed because I have relapsed?