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Going king-size

Pierce JP, Sargent JD, White MM, et al

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for smaller circumference cigarettes, the effective flow rate though the product is faster and it is possible that greater effectiveness may be observed for cigarettes with a circumference smaller than 24.6 mm

Man wearing protective filter mask activating electronic cigarette Captions are provided by our contributors

Much of that uncertainty comes from two major issues: cannabis has historically been illegal in many countries, limiting high-quality prospective research, and most people who smoke cannabis also smoke tobacco, making it difficult to separate the effects of one exposure from the other