I use both e-cigs and regular ones. When I bought the e-cig, it was not my intention to quit smoking. I was actually trying to make it easier to 'smoke' since I live in NY and pretty much everywhere is a tobacco-free zone. No smoking in bars, restaurants, hotels, even some shopping mall parking lots and outdoor amusement parks are smoke-free. Some places provide roped-in areas for smokers, which to me is ridiculous since it is outside anyhow. I understand that non-smokers do not want to be exposed to cigarette smoke, and I don't blame them. And now CVS will stop selling tobacco products and they are claiming it is because they are a pharmacy and in the health business and just shouldn't sell those kinds of things. Oh but they still sell processed junk food, soda, and alcohol! Sorry, this is turning into a rant lol.
I find that while in smoke-free zones the e-cig does just fine. I still smoke regular cigarettes when I can. I heard that a regular cigarette has 25 mg of nicotine, which may or may not be true. Most 'juices' for e-cigs come in varying levels of nicotine, so I started at 24 mg and you can go down in increments of 2 until you're at zero nicotine, if you'd like. Since I'm not ready to quit, I'm around 18 mg because it's enough to take the edge off when I want a cigarette but cannot have one due to my surroundings being smoke-free.
My advice is to buy a lower end one to start, with juice that is similar to whatever you smoke now (menthol, etc). I would stay away from the fruity and candy type flavors until later, as when I started the e-cig and got tutti-frutti juice it did nothing for me when all I wanted was a menthol. When I got my e-cig, I rarely put it down. I would just hold it & hold it and puff, puff, puff! So I timed myself smoking a real cigarette (5 minutes) and then tried to use the e-cig for the same amount of time before putting it elsewhere. I'd suggest starting at the higher nicotine percentage too, because no one told me this and I started out at 11% and wondered why I was flying through a tiny bottle (aka a 'carton') over a matter of days.
I did use my e-cig successfully for about 4 days, and then I had a real cigarette because they were there. What a difference! The e-cig tastes cleaner and doesn't make me feel like crap - which is what the real cigarette did to me after 4 days of not having one.