Benzos and THC work on totally different receptors and have completely different pharmacology so it’s entirely possible that you’d be sensitive to one and not the other.
We also still don’t know a whole lot about how the endocannabinoid system interacts with other signaling systems so it’s also possible that you could be sensitive to both or neither.
People can also be relatively unaffected by cannabis edibles but will get their doors blown off by smoking / vaping. Edibles undergo first pass metabolism when broken down by the body and as you’d imagine this process has significant individual variability. THC inhalation generally produces more “predictable” effects.
Nothing earth shattering here but I always like to point out some of this stuff when people say “weed doesn't affect me” or “weed makes me paranoid”. I’d be willing to bet that by playing around with different types of products (different cannabinoid concentrations), dosages, and routes of administration, THC can still be a viable option for people looking for relief (even if it doesn’t seem that way at first). This is especially true for those who are cannabis naive and have only tried it a handful of times.