"Down the corridor in BAT [British American Tobacco] you have a division who are spending all their days trying to work out how to gut, thwart, and ruin any policy like plain packaging."

The main results were as follows: "In thesurvey of e-cig users, dependence on e-cigs was significantly lower than it hadbeen on cigarettes (8.6 v 14.9). ... Currente-cig users are significantly less dependent on e-cigs than they were oncigarettes prior to switching."

A third major advantage of a clinical trial is that conditions are controlled as carefully as possible, minimizing potential biases. Both sampling and measurement bias are greatly reduced, if not eliminated. In contrast, survey studies are generally subject to significant sampling and measurement bias.

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