Affirmations are a great way for reclaiming your power. Why not replace stressful thoughts that are not serving you with ones that can help you shift into a more empowering state of mind ?
These come from Louise Hay , who is a most inspiring master of positive thinking :)
I lovingly take back my power. I release this old idea and let it go.
I give myself permission to change.
No person, place, or thing has any power over me. I am free.
I create a new life with new rules that totally support me.
The past is over. I choose to love and approve of myself in the now.
I easily and comfortably release that which I no longer need in life.
I am doing the best I can. I am wonderful. I am at peace.
I am willing to change and grow. I now create a safe, new future.
I refuse to limit myself. I am always willing to take the next step.
I choose to handle all my experiences with love, joy, and ease.
I move beyond past limitations into the freedom of the now.
I love and cherish myself. It is safe for me to care for myself.
I now choose to support myself in loving, joyous ways.
All desire for cigarettes [or alcohol or whatever it is you're addicted to] has left me and I am free.


While repeating or writing affirmations dozens of times will not do ALL the work for you , they are an amazing tool for assisting change and breaking free of limiting patterns, BUT , you have to be willing to change and do some work ;)