In general, using electronic cigarettes is significantly less harmful than smoking regular cigarettes, due to the absence of tar and heavy metals. The liquid contains components often used in the food industry, namely food flavors, propylene glycol and glycerin. The most harmful thing is nicotine, but it is not an obligatory component, so the user can vape nicotine-free liquids, which are very popular among those who want to completely give up this substance. If you are looking for a really high-quality option, here you can always find herbal vaporizers in Canada