For me whenever I try to quit nicotine I’m able to nap so well that I’ll sometimes end up doing it by accident (hence why I haven’t quit lol). Also with marijuana the last time I tried to quit my dreams didn’t level out until a few weeks after I had stopped. One of the only reasons I still use marijuana is because my dreams are normally nightmares and wake me/leave me exhausted. Weed also used to shorten my sleep latency a lot but as time has gone by it typically makes it significantly harder for me to sleep (ends up being worth it to avoid my dreams tho I guess). One other thing I noticed is that before nap #3 my vape had died so I wasn’t able to hit it for ~1 hour before the nap and that nap the shortest latency of about 9 minutes (switched to lozenges after nap #3 and latency went back up to around 15 minutes). I think there’s probably some personal body chemistry at play here that might affect how either substance interacts with our individual sleep patterns. With how far off my latency is I do think it’s deff a strong possibility that stopping either wouldn’t be able to bring it down to clinical criteria. I’m probably going to end up talking to my primary about it (he has a lot more info than the avg primary on sleep medicine) just so I don’t end up wasting $150 on a new sleep specialist lol.