Depends on the "pen", don't it. Those cheap and cheerful EVOD "starter kits" are crap, but once you move up the range a bit you can get better ones where you control the amount of air mixing with your juice and that's enough for me, no farting about with setting watts and everything and you end up with something more convenient to carry around in your pocket. Plus you don't get the association of being one of these bellends who thinks it's great to turn it up full and turn everything 2 foot around them into fog because they think it's funny that these housebrick modkits can do that.
But, truth be told, I'm a smoker, I self-identify as a lesbian. There is a difference.
And it's good for you you found it so easy to give up nicotine, I can't and, by christ, I've tried. I found it easier to give up marching powder, did that overnight but know I can never go near that stuff again or I just want more as you never lose or cure an addiction but only control it. But nicotine? That's a bastard, I can't shake it which is why I moved to vaping weed and CBD so I could keep cutting back bit by bit, it's all psychological and I know I cannot just quit so have to back off slowly until I can get that level of control.
The good thing is I can't stand the taste of pre-made cigarettes any more, so only vape when out of the house as plod tends to ask too many questions when you have a "large" hand-rolled in your mouth, even when they can smell it's only tobacco, unless it's the occasional cigar because I love the taste. So the best I can really do is minimise use and keep cutting back bit by bit and it'll come in it's own time. And, of course, the famous acronym "DILLIGAF" definitely comes into play as, well, stressing meself over tobacco is not the way to get the addiction under control so, like with my other problems, not giving a shit helps, if I totally quit, then I do that. If I don't, then I don't. It's the hand I've been dealt, I have to play it, nothing can change that so why add unnecessary stress which is only likely to lead to failure?
It's all in the head, and if that lump of grey gunge between the ears was so simple to understand and use in the "right" way we'd be so simple we couldn't. Everyone's different, we're all wired differently, and with the amount of times I've had 240v up my arms there's definitely a few short circuits. What will be will be, just have to find the right road to follow and, well, I've always preferred the slower, scenic, route over the freeways all the arseholes drive on...