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"Variable Name","Variable ID","Variable Description",Version,"dbGaP Mapping" PX330502_Perception_Risk_Electronic_Cigarettes_Ever,PX330502010000,"Have you ever seen or heard of an electronic cigarette or e-cigarette before this study?",0,https://www.phenxtoolkit.org/protocols/view/330502 PX330502_Perception_Risk_Electronic_Cigarettes_Harmful,PX330502020000,"Is using e-cigarettes less harmful, about the same, or more harmful than smoking cigarettes? ",0,https://www.phenxtoolkit.org/protocols/view/330502