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Specifically, one 1R6F standard research cigarette (Kentucky Tobacco Research & Development Center, Lexington, KY, USA) was smoked per cycle (one cycle in total), with a puff volume of 55 mL, a puff duration of 2 s, a puff interval of 30 s, and a puff exhaust time of 8 s (Fig

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Our final analyses were thus conducted for 3533 adults who were used e-cigarettes daily or some days, used restricted flavours and met all other study criteria (online supplemental figure 1)

According to the 2013 National Survey on Drug Use and Health conducted by the Substance Abuse and Mental Health Services Administration (SAMHSA), 5.7 million people over the age of 12 use marijuana daily or almost daily, and 8.1 million people over the age of 12 reportedly used marijuana on 20 or more days within the month prior to completing the survey 1