They write:

One of the first things you need to decide is if you like a sweeter taste, or a real tobacco taste. At first, many smokers prefer an e-juice with a tobacco taste, but many will gradually shift into sweeter flavors like apple or strawberry.

2. The subjects did not provide informed consent for their participation in the research.

In their to this response, the authors of the study clarify their reasoning for attacking the cigarette companies, even though they merely complied with the law:

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