These may be resulted from heavy metal vaporized into vaping aerosols from the heated coils of e-cigarette, which are usually made with nichrome (combination of nickel and chromium) and stainless steel (Traboulsi et al., 2020)
However, considering this as part of a quit smoking plan can increase your chances of success, so incorporate strategies for handling and managing the physical, mental, or emotional challenges of smoking withdrawal that can occur, whether they do or not
Distraction is a great way to take your mind off smoking, and taking up a new hobby or activity can not only reduce your nicotine cravings, but it may also just teach you a new life skill
Don't do it in your seat, don't do it in the lavatory, don't "zero out" the hit and assume nobody will notice