Comparison of Nicotine Replacement Therapy and Electronic Cigarettes for Smoking Cessation in Pakistan

Background:

The use of tobacco in its various forms remains the most common cause of preventable deaths in the world. Every year, 8 million people worldwide die of tobacco-related diseases. The highest burden (80%) is in underdeveloped and developing countries like Pakistan. Pakistan is a country with the fifth-highest burden of tobacco use in the world, with more than 15.6 million adult smokers. 21.9% of adult males and 3.4% of adult females are current cigarette smokers. In Pakistan, every year, around 160,000 lives are lost to tobacco use, and the impact on the economy is more than 1 billion dollars.

Despite this, smoking cessation services are not well established and are limited to a few facilities, predominantly in urban centres. These facilities don't have well-established cessation support programmes, and only provide basic behavioural support. Smoking cessation medicine like Nicotine replacement therapy (NRT) is available in Pakistan but very expensive. Over the past decade, the use of EC has increased in many countries around the world. Evidence suggests that current smokers use EC to reduce the number of cigarettes smoked per day, and ex-smokers use EC most commonly for cessation purposes and to prevent relapse. EC use in Pakistan has also become more common in the past few years. Electronic cigarettes are readily available and significantly cheaper than NRT. EC have great potential as stop-smoking aids; however, EC are not prescribed or recommended for this purpose in any of the smoking cessation centres. The purpose of this study is to evaluate the efficacy, safety, and cost-effectiveness of EC versus NRT for smoking cessation in the adult population of Pakistan.

Design:

The study is a pragmatic, parallel, open-label, randomized controlled trial of NRT with EC. Participants will be adult smokers who are willing to quit and have no preference for NRT or EC. 438 participants will be enrolled. A baseline assessment will be carried out to determine the demographic profile (age, sex, location, socioeconomic measures like income status, education, and employment. A detailed smoking history, including numbers of cigarettes smoked per day, history of quitting, quit attempts, past use of NRT, and past use of EC, will be reviewed. A complete medical examination by qualified clinicians will be conducted to determine eligibility for the study. Eligible participants will be randomly assigned to one of two treatment arms: EC or NRT, with 219 participants in each arm. The study will be conducted in 10 cessation clinics (SCC) across six districts of Pakistan. The NRT arm will be given a combination therapy of a nicotine patch and a faster-acting oral product of their choice (gum or lozenge). The EC arm will be provided with a refillable, 3rd generation EC device and a choice of 3 e-liquid flavours: tobacco, menthol, and fruit. Enough e-liquid will be provided to last until the next supply which will be after an interval of 4 weeks. Further supplies of e-liquids will be provided based on participants preferences. Both arms will be given supplies for 12 weeks and provided with standard behavioural support. The primary outcome measure is self-reported sustained smoking cessation at 52 weeks (one year). This will be verified by carbon Monoxide (CO) validation. A level of less than 8 ppm will be considered abstinent. Secondary outcome measures are CO-validated self-reported sustained abstinence at 24 weeks, self-reported 7-day point prevalence abstinence at 4, 24 and 52 weeks, change in the number of cigarettes smoked per day, time to relapse, and frequency and severity of adverse effects. An analysis of the average cost of treatment per participant will also be conducted.

The analysis for each outcome will use intention-to-treat (ITT) principles. For the primary analysis, the proportion of people who remain abstinent at 52 weeks (1 year) will be determined, and a comparison will be done between the NRT and the EC groups. Because the data variables are categorical, Chi-squared test will be used for significance testing. In our secondary analysis, we will examine time to relapse using Kaplan-Meier curves with Log Rank test for significance testing and Cox regression for Hazard Ratio analysis. We will compare the RCT groups using Chi-squared and logistic regression analyses for the proportion of participants that remained abstinent at 4 weeks and 24 weeks. Rates of adverse reactions will also be compared between arms using Chi-squared tests. The trial will include a cost comparison of total cost of ownership to see which method is the cheaper method, which can then be viewed in relation to their respective quit rates.

Discussion:

This will be the first randomized controlled trial comparing the effectiveness of NRT with EC in Pakistan. Pakistan does not have a national tobacco cessation policy or programme. No research has been conducted to determine the best options available for tobacco cessation in Pakistan. This study is important as it will provide an opportunity to develop Pakistan's first evidence-based smoking cessation policy, which can lead to the development of a comprehensive tobacco cessation programme.