electric cigarette will not help you to quit smoking, so if you want to quit smoking try to reduce its, IMO.
Of course it will. What are you talking about? When it comes to the liquid for your vape pen you can choose the nicotine dosage and flavors. You can start off high to satisfy a heavy smoker and then keep reducing it every few weeks (12 -> 9 -> 6 -> 3 -> 0 mg). Eventually you lose the addiction to nicotine and you can either vape at 0 mg if you like it or stop completely. This works much better than any other method (e.g. patches, gums). I've been through this process and know a few people that are halfway there.
I honestly do not know what it vape pen but I ever not smoked for 3-4 days and I can. it all depends on your own intentions what percentage you want to quit smoking? if you have a strong intention to quit smoking I'm sure you can.