Just my personal experience here.
After returning from Thailand and smoking weed, 5 or 6 joints daily for 4 months it was time to clear my system as i regularly get tested via urine and saliva tests.
It was tough as i constantly thought about smoking a nice joint for a couple of weeks, but didn't crack.
I have gone through this process many times over the last 40 years.
I believe THC 'addiction' is psychological rather than physical, wanting rather than needing.
Nicotine on the other hand... i hate that i use nicotine but try as i may, too many times to mention over the past 40 years, i can not stop, without nicotine i am consumed with thoughts of how to get some and i feel somewhat different bodily.
For me there is a big difference between bodily needing nicotine and mentally wanting THC.
Others may well have different experiences though.