e cigarette sensor A prototype smart e-cigarette with an e-cig topography sensor. (a) powered with USB recharging Vape Detector - Vape, THC
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![Distribution of tobacco farms in the US in 2004. Source: [59]](https://www.researchgate.net/publication/360576052/figure/fig1/AS:1184312279994371@1659373459838/Distribution-of-tobacco-farms-in-the-US-in-2004-Source-59_Q320.jpg)


















