E-cigarettes and traditional cigarettes which is more harmful

Harmful: traditional cigarettes>e-cigarettes

I'll take the iQOS that many people around me are using as an example to talk about it~

Traditional tobacco will produce a large number of harmful and potentially harmful substances because of high temperature combustion when it's in use. The iQOS is a temperature controlled device that heats up and does not burn, and the nicotine is released with the aerosol, which reduces the formation and production of harmful substances.

When my friends use it, I don't feel much of it ~ it feels a lot better than traditional cigarettes.