Mark Hall, a professional hypnotherapist and licensed social worker, was well aware of that, of course. He quit smoking many years ago himself—he says he still remembers reaching for a phantom lighter that wasn't in his pocket—and he has been holding sessions like these for more than 20 years, aimed at convincing others that they can do it themselves. Typically his hypnotherapy sessions cost around $150, or $95 with insurance coverage, but this event, sponsored by the Sanborn Foundation for the Treatment and Cure of Cancer, was near my home, and open and free to the public. In other words, there was no reason not to go, except, perhaps, a question that had been frightening me all week as the meeting approached: What if it doesn't work? Or, maybe even worse: What if it actually does? Then what the hell am I going to do? As crazy as it sounds, smoking is such a major part of my daily routine, the prospect of losing it is scary.
Some popular beliefs attached to weight loss have been shown to either have less effect on weight loss as commonly believed or are actively unhealthy. According to Harvard Health, the idea of metabolism being the "key to weight" is "part truth and part myth" as while metabolism does affect weight loss, external forces such as diet and exercise have an equal effect. They also commented that the idea of changing one's rate of metabolism is under debate. Diet plans in fitness magazines are also often believed to be effective, but may actually be harmful by limiting the daily intake of important calories and nutrients which can be detrimental depending on the person and are even capable of driving individuals away from weight loss.
It is used for a wide variety of applications, and studies into its efficacy are often of poor quality which makes it difficult to determine efficacy. Several recent meta-analyses and systematic reviews of the literature on various conditions have concluded that the efficacy of hypnotherapy is "not verified", that there is no evidence or insufficient evidence for efficacy.