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It sounds so well-intentioned: Preventing “harm” to consumers by erring on the side of scientific “doubt.” But the practical effect of the so-called “precautionary” principle is often just the opposite: denying consumers ready access to demonstrably beneficial goods and services. A good example is the rapidly expanding “vaping” industry. Billed as a safer and cleaner alternative to tobacco, vaping features an odorless and colorless liquid heated with a battery-powered unit [...]