“…Acupuncture research is difficult because the accurate treatment duration, acupuncture frequency, duration of stimulation, acupoint and control selection, and sufficient sample size cannot be determined; thus, the effects of acupuncture therapy for drug addiction are controversial, particularly in clinical applications [7, 46, 57, 58]. Nevertheless, the mechanism through which acupuncture alleviates drug addiction probably involves regulation of brain pathways and restoration of the unbalanced central neural pathways through the modulation of neurotransmitters, such as dopamine, norepinephrine, serotonin, and endogenous opioids [46, 47, 59, 60]. Hence, future studies must integrate these basic findings and determine clinical therapeutic effects of EA.…”