I had a chronic low-grade sinus infection for 3 years. It was miserable. Constant post-nasal drip, clogged ears, clicking, popping, etc. Oregano Oil and snorting Lactobacillus sakei is the only thing that cured things.
This is just my experience, but my endocannabinoid system is just flourishing. I, unfortunately, started smoking cannabis at age 16 and was using daily by age 18. I quit for 5 or so years in my mid-twenties and picked it up again in my early 30s.
In my early 30s I find the only useful thing about it is local gardening/foraging communities I participate in. Outside of that, there's nothing but fluff.