The e liquid that is vaped by the smokers hasn’t proved that it is safe. But there are numerous studies which stated the safety of this product. One of those people who committed their time and money regarding the effects of e liquid is Dr. Farsalinos.
But despite that it is better than electronic cigarettes; it doesn’t guarantee you that it will not give you any side effects. If not taken moderately, the vape will increase your heart rate and blood pressure. So you still need to be cautious once you smoke the vape.