Cigs leave tiny lacerations in your throat, vapor gets less irritating as you leave the cigs behind... which can be quick as many posts here suggest, but don't give up if it seems harder or slower for you. (I preferred slower to harder.)
I usually use a technique with EVODs of allowing in a little air with the vapor, cools it and oddly increases flavor when done right, probably the turbulence. The clearomizers are very low power and often it's more a problem to get low enough power and/or voltage to them. So watch out for burning tastes, stressing them, and avoid higher settings if any. Especially with the original EVODs -- I prefer these with most ejuice, they bring out flavor to an unusual extent. The more recent dual coil EVOD 2 has cleaner flavor but less of it. Usually.