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Q: Does the juice or flavor for electronic cigarettes pose kashrus issues?
A: Yes.
Electronic cigarettes convert a specially formulated liquid into a vapor which the person inhales in a manner that mimics the way one inhales from a traditional cigarette. The liquid (which is sometimes called juice, smoke-juice, or similar names) typically includes kosher-sensitive ingredients such as glycerin and flavors, and since the person imbibes the liquid/vapor, Rav Schwartz said that the liquid must be certified as kosher. We contacted a number of manufacturers who claim to use only kosher raw materials but there is no independent agency who certifies that claim, and therefore we are unable to recommend those products. [As with all medical issues, one should consult with their doctor before deciding to use or not use electronic cigarettes.]