Long term sleep issues

Has anyone else experienced long term issues with sleep since quitting nicotine?

I had this terrible habit of vaping only a few times a day, with a mighty powerful setting, for a few years. Every single day I would do so right before I fell asleep.

I quit very slowly, taking weeks to lower my setting and eventually using patches, so my sleep was mostly unchanged by that. But the lasting impacts on my sleep have been terrible since quitting.

That was almost six months ago and it still takes me 1-2hrs to fall asleep every night, far longer than before. Yesterday, I was so frustrated with this that I just hit my vape anyways to fall asleep and was out like a light in a minute afterwards. Threw it away this morning so I'm not really upset or concerned about a relapse, but just frustrated with how dependent I still feel on this to fall asleep. Will this ever go away?

Also, I use melatonin, exercise 1.5h+ daily, have a consistent sleep time, don't eat much processed food, and only drink on weekends.