You and I could not have more disparate experiences.
Not having any THC for a few weeks does noticeably impact my tolerance and weed is 100% not an addictive substance. I just recently quit using nicotine. A chemical addiction and it's withdrawal has a distinct feel to it. THC doesn't do anything related to a chemical addiction. Starting or stopping using weed is as simple as making a decision. It lacks the "pull" of a chemically addictive substance.