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She meets Thomas, a sweet, confused amnesiac who cannot remember that he used to be a vicious pornographer, responsible for turning his young wife, Sofia, into the worlds most notorious porn queen

The issue here isnt so much the study type, but the way you ask the question

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We want to learn if dual users dependence levels differ from each other and also from exclusive e-cigarette or cigarette users. Perhaps most critically, the same PATH participants will be surveyed on an ongoing basis, and the results of future waves of data may show if experimental e-cigarette users eventually are converted to regular cigarette users