Is it bad to start vaping when you have no history of smoking? if i use 100% vegetable glycerin and use no nicotine in the mixture?

Not rec.: Vaping is not proven to be safe, although we do know that nicotine is definitely harmful. I would not recommend that you start vaping. Avoid second smoke exposure if you can.

Avoid vaping: Vaping even 1 nicotine-free electronic cigarette (e-cigarette) “can produce transient changes in blood vessels similar to those seen in early atherosclerosis” REF: https://www.medscape.com/viewarticle/917031