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At the same time, the authorities in Viet Nam need to strengthen the enforcement of the ban on the advertising and promotion of tobacco and nicotine products, including e-cigarettes

nevertheless, our objective was not to describe the populations with the aim to extrapolate the results to a wider population of smokers, but to compare two scales of nicotine dependence in two populations of smokers to explore potential differences, taking into account some selected sociodemographic variables and smoking characteristics, which is the main strength of this study

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Collider bias may occur when analyses are controls or selects the sample based upon a collider variable that is caused by both the exposure and outcome variables and distorts the true underlying association 48,49