Therefore, the quality of such a quasi-experimental design primarily depends on the baseline similarity on relevant variables of the participants in the ACt group and those in the control group. In a quasi-experiment the practice of the ACt is monitored and the changes are compared to the changes in an independently recruited cohort of smokers, implying that no randomization took place. Therefore, we tested the ACt in companies in a quasi-experiment. For example, once companies are interested in the ACt, they want to be certain that they can offer the ACt to their smokers, and they find it less desirable to let their smokers be randomized or to be randomized as a (department of) a company to the ACt condition or a control condition. This implies that the test of effectiveness must be conducted within the setting of the companies, taking into account the demands and desires of companies that join the study. In the present study we aimed to assess whether providing the ACt to smokers in companies is effective in stimulating abstinence from smoking. For example, recruited smokers might be randomly assigned to an ACt condition or to a no-intervention control condition. The best scientific design to test whether the ACt method incorporates effective ingredients is the RCT. Thus, although the ACt seems widely used, very limited evidence is available with regard to its effectiveness. Two other studies in AC smoking cessation clinics reported percentages abstinence up to 26%. One study reported that of 357 smokers exposed to the ACt in a company, at least 40% reported point-prevalence abstinence after 12 months, while in the cohort study (N = 510) 51% of the smokers reported abstinence about 3 three years after the ACt. Only percentages of abstinence from cohorts of smokers who followed the training are published. However, few data are available on the effectiveness of the training. There are stop smoking seminars in more than 150 cities in over 45 countries worldwide” In the Netherlands, the licensee holder of the ACt primarily provides the training through companies, exposing about 1,500 smokers to it each year. The Allen Carr website states they have: “… sold over 10 million stop smoking books in 57 countries in more than 38 languages Every year Allen Carr’s Easyway To Stop Smoking Clinics and online quit smoking programmes cure over 50,000 smokers. The method also has been published widely in book form. Allen Carr’s “Easyway to Stop Smoking training” (ACt) is an one-session smoking cessation group training that is provided by licensed organizations that have the permission to use the Allen Carr method.
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