What is the best electronic cigarette?

Best for what: I think ultimately you will have to see if Consumers Reports or some other such publication reviews and ranks these products. I do not recommend them. Some of my colleagues think they may ultimately help some people quit smoking, but so far the evidence is in the opposite direction. People use them because they are thought to be safer, and ultimately smoke MORE, not less. Their safety is unknown.

APV vs Ecigs: The one that gets you to switch entirely from smoking to vaping. Nicotine dependent smokers (those who smoke first thing in the morning) find that ecigarettes dont satisfy their nicotine cravings. However, the third generation nicotine vaporizers (which are often confused with ecigarettes) are highly effective in getting heavy smokers to switch to vaping. UK study reports 80% conversion rate