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there are liquids whose composition does not include this substance

With a majority of users today expecting even budget options to be of premium smoking lighter quality, the result is that brands are compelled to come up with innovations such as USB smoking lighter, jet flames, and hybrid designs

As between-study heterogeneity can be underestimated or even zero when the number of studies is small 196,197 , we used Fishers information matrix to estimate the uncertainty of the heterogeneity 198 and incorporated that uncertainty into the final results

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A tax structure that uses a sliding scale based on product health impacts can discourage use of the most harmful products