Thoughts are just thoughts. They have no power beyond how you choose to react to them. For me it was not about conquering my thoughts but detaching from them. That way instead of running on autopilot I now have a choice. A simple tool I used at one time was whenever I felt a craving for alcohol I said in my head "No thank you, I don't drink". By externalizing the craving it now had less power, by saying no thank you I reinforced my desired behavior.