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Source: Cigar Aficionado
The methodology of TSPO imaging with positron emission tomography

Soft-mesh restraints, such that only the noses of mice are introduced into the central channel through which the E-CIG vapor flows, were used in this study to focus the E-CIG vapor exposure to the respiratory system, creating a physiologic exposure model of E-CIG use

And many trials that return positive results are funded by the pharmaceutical industry