From The Kosher Information Bureau: Pesach News – Vaping

In Newsletter Items, Pesach Alerts 2020 by kosherqu

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.