Auricular Acupuncture, Education, and Smoking Cessation: A Randomized, Sham-Controlled Trial

This randomized controlled trial investigated the efficacy of auricular acupuncture for smoking cessation, comparing different therapeutic approaches over 18 months. The research was motivated by the need for higher-quality studies in this area, responding to the criticisms of a Cochrane meta-analysis that questioned the available evidence on acupuncture for smoking cessation. The study design included 141 adult smokers randomized into three groups: true acupuncture combined with an educational program, sham acupuncture combined with education, and true acupuncture alone. The acupuncture protocol used auricular points traditionally employed in the treatment of chemical dependence: Shen Men, Sympathetic, Lung, Kidney, and Liver, along with point LI-4 (Hegu) at the wrist.

Treatments were administered five times per week for four weeks by highly qualified acupuncturists certified by the National Certification Commission. The sham group received needling at points located up to 5 mm from the true points, maintaining participant blinding. The educational program consisted of 1.5-hour sessions twice a week during the first two weeks, then weekly, incorporating behavioral training, education, social support, and relapse prevention. Results showed significant differences between groups immediately after treatment.

The group that received acupuncture combined with education demonstrated the highest cessation rate (40%), nearly double the sham group with education (22%) and four times higher than acupuncture alone (10%). The reduction in cigarette consumption was also more pronounced in the combined group (53%). Although positive trends persisted during the 18-month follow-up, differences between groups lost statistical significance because of the high dropout rate, which reduced the statistical power of the analysis. An important finding was the significant correlation between pack-year history and treatment response.

Participants with greater smoking history (more than 20 pack-years) showed significantly greater reductions in cigarette consumption after treatment. This finding suggests that acupuncture may be particularly effective in the most heavily addicted population at greatest risk of developing smoking-related diseases, which has important clinical implications. Depression and anxiety scores, measured by the Beck Depression Inventory and the Zung Anxiety Scale, respectively, did not show significant differences between groups, although anxiety scores decreased over time across all groups. No significant adverse effects were observed except for occasional minimal bleeding upon needle removal.

The study followed rigorous safety protocols, including universal precautions for body fluids. The clinical implications suggest that combining auricular acupuncture with education can be an effective approach for smoking cessation, with results comparable to pharmacological treatments combined with behavioral support (20-25% efficacy at one year). The identification of pack-year history as a predictor of response offers valuable clinical guidance for patient selection. The study has some important limitations, including the high dropout rate that compromised the long-term follow-up analysis, the reliance on participant self-report to measure cigarette consumption without biochemical validation, and a sample size that, while adequate to detect immediate differences, proved insufficient for robust subgroup analyses.

Despite these limitations, the study represents a significant advance in the quality of research on acupuncture for smoking cessation, implementing many of the methodological recommendations suggested by the scientific literature.