They are operating at maximum speed and RPMs for those hundreds of miles
While its true that a personal vaporizer doesnt produce the harmful substances present in ordinary cigarettes (carbon monoxide, tar, arsenic, etc) and is therefore less harmful for pregnant women than ordinary cigarettes, there is so far no study demonstrating that the components of e-liquids do not present any risk for the fetus
Mndale Sen
Inserting a battery the wrong way round can damage the battery or the device
Next is action actually quitting
There are multiple causes of smell and taste disorders, with the most important ones being ageing, respiratory infections, head trauma, vitamin deficiency, medications, neoplasia, or environmental factors 1,2