I completely understand the whole must look like a cigarette thing. That does mean ALOT to some people. Its what they are used to.
When I quit, I went cold turkey, and by day two I was ready to do ANYTHING FOR A SMOKE! I remembered that my wifes and my yoga teacher had convinced my wife to buy a e-cig about a year before. So I tried it, I figured it would be better then smoking, and it was. I'm going on week 4 now, and have bought 3 more "kits" since that first one.
I smoked between 3-5 packs a day when I quit. What I needed was not what someone else needs. That being said, I would love to give y'all some of my experience. As I said my wife had one that she had had for a year. She had actually bought a pretty good one for not knowing anything about them. I was vaping my first VAPE on a "Joye 510" ( Joye is the manufacturer, the model was the 510) it was very satisfying. She had about 20 pre filled cartridges that had been given to her from her friend as well, plus about 15 empty ones, and there was a 15ml bottle of some sort of E-Juice (to this day I have no idea what was in it). One of the batteries was "manual" and one was an automatic. The manual one has a little black button that you press a couple of seconds before you take a drag off of it. The manual you just take a drag, and it figures everything out. (I've since learned that the automatic batteries have a design flaw, a small hole where it meets ith the cartridge with the nicotine juice, so it can tell when you are taking a drag, and it can activate, the down side is, that in a very short amount of time the nicotine juice will leak into the hole, and ruin the battery, and it will die prematurely, these small batteries are not cheap to replace, compared to the cost of the whole package) the biggest problem that I had was the length that the battery would last, and the length the cartridge would last as well. I would at the worst get 15 minutes outnof the battery, at the best 45 minutes. Each battery takes 1-2 hoursnto charge. I LOVED this idea of being able to quit, and not feel like I had lost my best friend, or I wanted to die, or kill everyone I met. (quitting is very hard), so I did no research, except to find out what the model was that I was vaping, and googles it. I then found a model called the Joye 510Mega. This model is just like the Joye 510, except the battery is longer, the attomizer (the heating element that turns the liquid into vapor) was longer, and the cartridge was longer (which meant that it held almost twice the amount of juice as the 510, meaning I could VAPE ALOT longer without having to refill) this model still looks like a cigarette. Maybe a long cigarette like a 100 or something, but it felt perfect, perfect drag, perfect amount of vapor production, good "throat hit" (meaning the vapor actually FEELS like smoke when taking a drag).
So if it is VERY important for him to find one that looks like a cigarette, I would go for the 510Mega, maybe also order something called a PCC (personal charging case) it is a small container that has a battery in it, and if you are out and about and kill a battery, you can get your spake out of your PCC, and place your dead one in there, and HOPEFULLY when you kill that that battery, the other one will be charged by then. Now one word about filling your own cartridges. There are ALOT of seedy companies out there that this is how they make their moneym so they sell this aspect of the whole thing. They want to set someone up on a recurring monthly charge, and mail them NEW cartridges every week/month whatever it is, and they really manage to rip ALOT of people off that way. Themtwo most used ways ov vaping currently are with 1: an atomizer, and a cartridge that slides into the atomizer. And 2: a "cartomizer this method combines the atomizer with the cartomizer, and it is only one sealed piece. There are ALOT of people on this site that prefer the cartomizer method, they say you can fill one up, and use it for "hours", then you unscrew that one, screw on another one that you had prepared before you left for the day and keep on going. You can refill these several times, I think the life span is somewhere around a week before you have to throw them away.
The first method (atomizer/cartridge) I found to be the easiest to use, fill, and maintain (plus I look at them as ALOT less wasteful. The cartridges can be used almost indefinitely, the atomizers all will fail eventually. Most say from 1-3 months. But with these when they feel like they are running out of juice, you slide the cart out, and drop 4-10 drops of nicotine juice in them, then slide them back in. With the cartomizer's, it's not as easy. They are a sealed unit. As I said I tried the cartomizer's several times, and did not find them to my liking, there are I'm sure just as many people on here that feel the same way I do, except in reverse.
All of that said, as I said it is REALLY EASY to fill your own, plusnthen you know what is in there, and it will ALWAYS be a better quality of juice, thus being a better quality of vapor, better feel, it will feel more like a real cigarette. The pre filled carts/cartomizer's are not as satisfying for the craving of smoking (at least to me) as the ones that I filled myself.
I think that should about cover it.
As I said everything I recommended are things that I actually purchased myself (the price for a Joye 510 kit can be as low as $40, and you should pass up anything approaching $70+) the same can be said for the Joye 510Mega.
Now I don't remember if I told you about the battery life on the Mega, for me it was an hour to two at most, and the cartridges for the mega were half an hour to an hour at most for me as well.
In the end, NONE of this worked for me. If I would have stayed there I would have been smoking within a week. But as I said I was a very heavy smoker.
I ended up (after the Joye 510Mega purchase) finding this site, and reading, and studying, and I ended up buying (something identical to) a "Riva 510" that model is actually a clone of a "Joye Ego". These models have a battery that lasts for 8-10 HOURS WITHOUT RECHARGING!! once I saw that and found the price (liberty-flights with a 20% off button top left of page) of $29.99 for a kit (you get TWO OF EVERYTHING) so for fourth dollars less then I paid for the Joye 510Mega I got a kit that I could use with both batteries charged for up to 20 hours without having to recharge?! I jumped all over that, then I found the "tank" system, it "holds" the e-juice in a much more efficient, and less messy way for ALOT longer time as well, well I bought that too, actually I found a kit for that too so I bought two kits at fifty nine each, one for me, and one for the wife, and my wife was able to quit with the Joye-Ego-Tank system. It was easy enough for her to figure out, and for her the charge on the battery is 20+ per battery, and the tank for her is 5+ hours (for me it's half an hour to an hour), the farther I got away from smoking, the more I loved vaping, and the more the thought of smoking made me discusted. But the whole bigger battery/big tank system, that is what really did it for me.
Mind you, these things look nothing like a cigarette, ice heard some people call them their little cigar, I do t know what it looks like, but I do know that if need be I now have 4 batteries for myself that each last for 8+ hours, and one that lasts for 12+ hours, and with all of that I am not afraid of being out somewhere, and all of my batteries dying, or ripening out of juice, and having nothing to VAPE. I keen it's not as if you can walk into ANY store in any town and buy any of this stuff, but I can walk into ANY STORE opin this town and buy as many cigarettes as I want. That's what I was topping for, the ability to not have to worry about running out. When I had the one that really looked like a cigarette, EVERY DAY that I left the house, I ran out of battery, one day it was for 12 hours, I don't know how I managed not to smoke, but I knew that I didn't want that to happen to me again.
I would like to apologize for how long this is. I seem to have a small learning disability, and have a very hard time getting my thoughts out of my brain through my hand, I've had it since birth. If I speak to someone, I can use very few words, and am very descriptive, however if I have to commit that same thought to paper, what may have taken me 5 words in speech, now may take me twenty to fifty, so every post is insane.
Tell your husband good luck, and that he can do it. I didn't think I would be able to, but here I am.
Of course we're looking for a great product as cheap as possible too. 
