There is a growing body of research that shows vaping does have a positive effect on smoking cessation and the reduction of harmful substances in the body. The harmful substances in cigarettes, such as tar and carbon monoxide, are not present when vaping. ... CALIFORNIA PROPOSITION 65 - Warning: This product can expose you to chemicals. At what wattage does vaping produce formaldehyde? At 5.0 volts, however, measurable quantities of formaldehyde-releasing agents were found in the tube. The researchers calculated that a person vaping at 3 mL of e-cigarette liquid per day, using a 5-V device, would inhale 14.4 mg (SE 3.3) of formaldehyde daily in the form of formaldehyde-releasing agents.