http://www.webmd.com/smoking-cessation/new...por-study-finds

"Health experts have long known that formaldehyde and other toxic chemicals are present in cigarette smoke. Initially, e-cigarettes were hoped to be without such dangers because they lack fire to cause combustion and release toxic chemicals, a Portland State news release said.

But newer versions of e-cigarettes can operate at very high temperatures, and that heat dramatically amps up the creation of formaldehyde-containing compounds, the study found."

"When the vapor device was used at the realistic setting of 3.7 volts, levels of formaldehyde were similar to the trace levels that are released from an FDA-approved [smoking-cessation] inhaler," association President Gregory Conley said. "However, when the researchers increased the voltage to 5 volts and continued to have their machine take three- to four-second puffs, this caused extreme overheating and the production of formaldehyde."


So dont go over 4V? LOL

If its released by studies from a far more advance country like US or AUS, OK la hati2 when buy juice or choose mod,
Kalau M'sai pny, PUIIII, buta pn tau gov is losing tax money in tobacco because of vape. Some even try to put hidden massage that conventional cigarette is better.

So... to ans ur Q it'll be a advice + popcorn

Im sure Dr. Dalilah did.