According to Rav Sterhbach, vaping is considered in the category of food (eating) and therefore, because of non-Kosher flavoring, vaping all year round is problematic from a Kashrus standpoint, and also may contain elements which may also be Chometz – an issur on Pesach. That is why he feels that this product needs proper Hashgacha all year round as well as for Pesach. NOTE: Vaping has been deemed to be dangerous to one’s health.