A meta-analysis of all research studies on the Transcendental Meditation Programme related to cigarette smoking, in comparison to meta-analyses of standard treatment and prevention programmes for smoking, found a significantly greater reduction of cigarette use among those who practice the Transcendental Meditation Programme, even though this programme does not involve any guidance about change in lifestyle or habits.Ref.Alcoholism Treatment Quarterly 11: 13–87, 1994

A study at Sumitomo Heavy Industries by the Japanese National Institute of Industrial Health found an increase in the number of employees that no longer smoked among a group of 427 employees that had been taught the Transcendental Meditation Programme, in comparison to a control group of 308 employees of the same work place. It was not the aim of the study to have practitioners quit smoking, but it was noticed as a spontaneous side effect.Ref.Japanese Journal of Public Health 37 (10 Suppl.): 729, 1990

A study among managers and employees in the automotive industry in the U.S. found that after three months of regular practice of the Transcendental Meditation Programme, employees had less cigarette and alcohol consumption in comparison to controls in the same work place. Reduced cigarette and alcohol consumption was not the objective of the study, but was noticed as a side effect.Ref.Anxiety, Stress and Coping: An International Journal  6: 245–262, 1993