Without reading too much, because I'm lazy, I'll just quickly explain my experience.
You can't force them, there's really no way to convince someone to make the switch. Either they will or they won't. I've tried to turn 4 people and was successful with only 3.
Lindsay - My best friend was really really against the idea of electronic cigarettes. She was worried about getting juice in her mouth or getting sick from it, and just in general liked smoking. I let her use my e-cigarette but I didn't really force it upon her, or say stuff like "you should really try to quit with this" or anything like that. I let her come to the conclusion that she'd like to try it herself, as soon as she showed any amount of interest, I ran to PIF and collected stuff to get her a kit. She was here for about a week and a half and smoked a total of 10 cigarettes during that time. She really likes it, and I'm pretty sure she'll be able to quit.
My husband - Thought e-cigarettes were really "gay" when I first started using them. He just sort of thought they were a novelty item and not really something one could quit with. Unfortunately when I lost my will power and went back to smoking this did nothing to disprove his theory. Eventually I worked my way back to the e-cig and quit for a good month. At that point, he admitted it was worth a shot. He successfully has been smoke free for two months now, and is severely impressed.
My Dad - After seeing Lindsay, Sam, and myself quit using these my dad was really interested so I got together a little starter kit for him. He spends a lot of time at the computer so SpiritAir lovingly donated a passthrough to him which he loves to death. My dad smoked for 35 years and was able to quit (albeit it was a bumpy ride for him) using them.
My dads Boyfriend - He looks at e-cigarettes like really foreign devices that are scary. I have so far been entirely unable to get him to use them. He simply has no interest. I have let him try several PV's, and many, many juices that I was sure he would like but still no go.
Moral? Some people are simply stubborn and will not convert. Some people are stubborn but just need to see success in action, and some people are ready and willing. Give it a while for your spouse, don't push it. Let him see how successful you are with it, when he notices how easily you quit and how much you like it, he will become interested and start sniffing around. THAT is when you attack