Relapses are not a "set back" per se ...not at all. When looking at HOW we humans make changes in our life, such episodes are simply part of the process.

The Process of Natural Human Change.

For us, change usually looks more like an upward spiral than a straight line.

Now SMART is here to minimize the occurrence of such episodes because they are serious and sometimes life threatening. However we look at them for what they are. Not a point to start over...but a point to "get back on the horse and keep riding" !