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Researchers who have studied hypnosis say more, well-conducted studies are needed to determine if hypnosis really helps smokers kick the habit for good, but add that hypnosis remains a hopeful approach and has many other benefits. However, the best way to quit may be to combine several techniques. Patients often require several different strategies along the way.
Recently some studies have been influenced by an evolutionary psychology perspective.[45] This includes studies on testosterone changes in sports which at least for males are similar to those in status conflicts in non-human primates with testosterone levels increasing and decreasing as an individual's status changes. A decreased testosterone level may decrease dominant and competitive behaviors which when the status conflicts involved fighting may have been important for preventing physical injury to the loser as further competition is avoided.[citation needed] Testosterone levels also increase before sports competitions, in particular if the event is perceived as real challenge as compared to not being important.[citation needed] Testosterone may also be involved in the home advantage effect which has similarities to animal defense of their home territory.[citation needed] In some sports there is a marked overrepresentation of left-handedness which has similarities to left-handed likely having an advantage in close combat which may have evolutionary explanations.[citation needed]
Hypnosis is not a psychotherapeutic treatment or a form of psychotherapy, but rather a tool or procedure that helps facilitate various types of therapies and medical or psychological treatments. Only trained health care providers certified in clinical hypnosis can decide, with their patient, if hypnosis should be used along with other treatments. As with psychotherapy, the length of hypnosis treatment varies, depending on the complexity of the problem.