Any chemical dependency. Any behavior or lack of it that is adverse to God's will for an abundant life. You know if a behavior is destructive. Be honest and go from there. There are other typologies, but these are basic and enough to deal with at one time.
Addictions are easier to deal with earlier in their process of development.
The sooner you deal with addictions, the more you will contribute to the help of others. That's my advice. Here are some places to start and some fundamental thoughts related to those approaches. If an addiction crosses over into one of these catagories, it takes on an entirely new dimension. These pages apply to all addictive behaviors, and many addictions could violate legal parameters.