For some scholarly exploration, see [0].
Whether or not there is strong evidence of physical addiction, the withdrawal experience is very real, and often unpleasant. Couple this with psychological dependence, and quitting can feel quite daunting.
The main issues right away:
- Problems sleeping due to REM rebound (vivid disruptive dreams or nightmares)
- Appetite issues
- General irritability
- Heightened anxiety (especially if using cannabis to treat anxiety)
If you’re using semi-medicinally, it’s extremely easy to hit these roadblocks, conclude “see I shouldn’t quit, weed isn’t so bad anyway”, and fall back into the habit.
I’m convinced that the reality of cannabis addiction/withdrawal is aggressively glossed over by the community of users who are very invested in what they’re doing being just fine. The truth is a bit murkier/darker.
I say this as a recreational-bordering-medical user (it does help calm down my PTSD) who enjoys using it, but who dislikes the inconvenient reality of trying to take a tolerance break.
- [0] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5414724/