Pyrate, as for getting your gf set up to quit smoking, there are 4 important things to be successful
1. Pick a device. Starter kits work and i See people quit smoking with them daily. Most starter kit batteries are fixed voltage and only put out 3.7v. If you get a starter kit, be sure to get a double kit. It is important to have backup if you want to quit smoking. Usually people end up upgrading into variable voltage/ wattage as they give you the ability to adjust your hit. They give you a bigger hit without having to work so hard for it.
2. Find the correct nicotine level. My suggestions. ..
6mg for 1/2 pack per day smoker
12mg for 1 pack per day
18mg, 1.5 packs
24mg, 2 packs a day
3. Find a flavor that she really likes. Try a bunch of flavors and don't settle for something that is just ok. If she doesn't like the flavor she may reach for a real cig instead.
4. Get rid of the cigs completely. If she depends solely on her ecig when she is having cravings, it won't take her long to realise how good they work. If she keeps real smokes around, she may end up using both
Hope this helps!