Given the political value of the gateway theory, opponents of e-cigarettes will not stop using this theory, even if the science behind it may always remain elusive.
To understand the links between vaping and smoking, we need comprehensive causal models that explain pathways between products in all directions, not just from vaping tosmoking. These complex, multi-dimensional models should allow for non-linear sequences of behaviour changeover time. Calling any causal model a gateway' reﬂects apreference for one of many possible pathways, and a partialpre-judgment of a complex question.
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Etter JF. Comprehensive causal models and harm minimization principles should guide regulations on vapourizers. Addiction . 2018 Jul 31. doi: 10.1111/add.14384. [Epub ahead of print] No abstract available. PMID: 30066353