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Are these new tobacco products effective cessation/harm reduction tools or do they act as a gateway to smoking

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If the findings of different research methods, with different biases, all point to a causal effect, it is much less likely to be spurious

This guideline provides technical guidance on a thorough set of tobacco cessation interventions for adults, and to support WHO Member States to use evidence-based behavioural interventions and pharmacological treatments for tobacco cessation as part of a comprehensive tobacco control approach