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For example, a 2017 study published in Respiratory Research found that asthmatic subjects who took part in a 1-h acute vaping session using non-flavored vaping liquid made with a contaminant-free mixture showed no increase in adverse effects in a controlled environment

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Reasons for the decline are likely multifactorial and may be related to the following: Increased public awareness of the risk associated with THC-containing e-cigarette, or vaping, product use as a result of the rapid public health response

"Currently, every other document on this particular list is a government-issued document, or it includes at least more than a name, for example a photograph," she said