Been treating my insomnia with the good stuff pretty much daily over a decade. Dry herb microdose vaping and getting down the timing of the high cycle is key to maintaining tolerance in the long term.
Let's touch on the later point quick first. Everyones different but for me being high is something like vape -> get high -> crashout(sleepy) -> (caffeine or more vaping). For me its like 30min-180mins of high followed by the crash depending on bud quality and its strains terp composition. If you can establish a time based sleep schedule to align your circadian rythm while timing the final crashout of the day at the same general time youre golden. If bedtime were 9pm I would smoke up two hours before maybe one moe hit 30 mins before bed. Usually if I'm crashing extra hit not needed.
Now for tolerance. Im going to be blunt with you, most cannabis smokers/vapers are doing it.... unscientifically. The first thought is just to smoke more to combat tolerance which works OK until you run out of bud or your lungs are covered in black tar. They've never heard of a dry herb vape or if they did its a decade old dinosaur like the fucking pax, never considered microdosing. For som reason most never wanted to understand what the bare minimum and healthiest vaping methods is. If your burning your bud, your doing more harm to your lungs than good to your brain. Also your wasting your herb big time. Sorry, thats how it is.
The journey that these questions lead me on changed my life and truly turned the herb into dosable medicine. You want to stop building tolerance forever? You need to work your way down to 0.05g-0.10g dry herb hits green. Its effectively the smallest unit of bud for an appreciable hit. You can microdose all day and never build appreciable T. it will basically fully reset tommorow or the day after.
And guess what? All the black and brown leftover After Vaped Bud is still good for use. Its fully decarbed and chock full of CBD,CBN, and some leftover THC. Save it up in a jar and process into nighttime cannaoil sleeping pills