Vicks contains Camphor and Menthol, both have been used for cooking for centuries. 50 mg doses of camphor are safe ( way more than would be fond in cooking or in Vicks). 2000 mg will likely produce serious symptoms; and 4000 mg is possibly fatal. But really, there is no benefit to eating Vicks, other than the menthol back flow you get from the vapour going up your sinuses as you swallow it. So just suck on a Hall's
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