A placebo has been defined as "a substance or procedure. that is objectively without specific activity for the condition being treated". [26] Under this definition, a wide variety of things can be placebos and exhibit a placebo effect. However, the placebo effect may be a component of legitimate pharmacological therapies: Pain-killing and anxiety-reducing drugs that are infused secretly without an individual's knowledge are less effective than when a patient knows they are receiving them. Likewise, the effects of stimulation from implanted electrodes in the brains of those with advanced Parkinson's disease are greater when they are aware they are receiving this stimulation. [27] Sometimes administering or prescribing a placebo merges into fake medicine. Common placebos include pills ("sugar pills") or saline injections. Fake surgeries have also seen some use. An example is the Finish Meniscal Legion Study Group’s trial published in The New England Journal of Medicine. which found a sham meniscal surgery to be equally effective to the actual procedure. [28] [29] While examples of placebo treatments can be found, defining the placebo concept remains elusive. [30] A placebo electronic cigarette contains 0 mg of nicotine. [31]
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