Believing that you can limit the damage of and / or come back after a relapse is like saying you can bungee jump into the abyss and have the elastic snap you back, that it's safe to speed because you can apply the brakes, and that you can go into the maze because you've tied the end of your ball of red string to a post at the entrance. The truth is that elastic, brake wires, and string all snap, and powerlessness means that your elastic, brake wires, and string are way past the end of their useful lives.