Avoidance Habits

Whatever we continuously do in place of the things we are actually supposed to be doing becomes an avoidance habit. Avoidance habits give us the feeling of being productive when we know we are supposed to be producing something else. Like the procrastination cycle from my last post, these habits are perpetual and can become hard to break.
What is avoidance? What is a habit? and what can we learn about avoidance habits to use them to our advantage?