Out of curiosity, does your guilt stem from what other people may be saying about e-cigs? I remember back when I first started up until I quit, a lot of people wouldn't give me any credit for quitting smoking because as you put it, they simply said I traded one nicotine addiction for another. That got to me in the beginning but I quickly dismissed their nonsense and vaped guilt free up until the moment I quit.
I've been in your position of going from 24mg down to 18mg and even 12mg only to jump right back to 24mg because it was a much more enjoyable vaping experience. I did feel a little guilt for the first few days, I was so proud to tell my wife that I'd dropped my nic level by half and I almost felt ashamed to admit I'd gone back up to 24mg. That feeling didn't last too long because I realized that for me it was going to be all or nothing. Whether I was vaping 12 or 24 I was eventually going to quit cold turkey.
Ultimately I ended up doing an extreme nic weaning going from 24mg to 2mg in about a week and that was the last week I vaped.
You really shouldn't feel guilty about vaping, at least not about your nic intake - if you're spending so much money on vaping supplies that you can't meet other financial obligations then yes you should feel guilty about it
IMO if vaping makes you happy and you're not ready to quit then why not make it as enjoyable as possible?
So I recently went from 18mg to 24 mg. I wanted to stop using my PV as a pacifier, and limit myself to a few hits to get my nic fix. I like the stronger nic concentration quite a bit, but it makes me feel guilty. Like I should be trying to quit… not trying to make my addiction more satisfying. I'm worried that my nicotine intake is higher than when I smoked.
Anything about vaping that makes you feel guilty? Maybe you bought a Darwin and the wife got socks for Xmas?