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It can be hypothesised therefore that the operation of such chemical reactions during product shelf-life might influence the efficiency with which these species are transferred from e-liquid to aerosol during puffing

Thats a heavy question

Adherence to the WHO FCTC Article 5.3 The third pillar of tobacco control involves protecting public health policies from tobacco industry interference

Shen said that because electronic cigarettes are not banned in some countries, travelers who attempt to bring fewer than five electronic cigarettes or related components through customs would face an administrative fine of between NT$200,000 and NT$1 million

It seems that the answer to the question is tobacco worse than weed has been found