Hypnotherapy is often used to break bad habits such as smoking, but also to reinforce new, better ones. It can be the bad habit of smoking but also the bad habit of thinking negative thoughts or stressing about non-important things.
Meditation is similar to hypnotherapy in some ways, both methods are effective for problems with anxiety, stress, depression and insomnia, and what works better for each person is individual. Why not try a session and see what effects it has on you?