And your observation could be easily explained in reverse: "I have witnessed secondhand that people who were susceptible to anxiety, agitation, paranoia, and psychosis due to {trauma|genetics|isolation|etc} and other misfortunes in life were also likely to start consuming higher doses of THC earlier in life, and employ other unhealthy ways to numb their mental anguish".
See my reading of the same facts is just as valid as yours, hence neither can claim to be true.
Note that I’m not saying you are wrong, nor am I saying he is wrong - but I am pointing out that your conclusion that neither of you can claim any truth is an unsound argument.
Furthermore, you also cannot conclude that a huge population of people who took marijuana with high THC content do not have a significant percentage of people who experienced adverse health effects from their drug-taking. To know that you would also need to have done an extensive study to conclude anything.
Now it may be you have done such a thing (or have read such a study) but without presenting such a study (or group of studies) then it’s also speculation.
If there was only one possible reading of the facts then that reading could be considered the truth. If there are two equally reasonable readings neither can be deemed to be the truth, and further investigation is required to clarify the matter.
In fact, one could be true based on enough evidence. Your claim of reasonableness is a red herring - it could be that one interpretation may seem reasonable but on further investigation it is not.
I’m merely pointing out you don’t know which proposition is true, not that neither can claim to be true. In fact, if one happens to be true then it can claim to be true, and will actually be true. That’s an important distinction.
Cult belhavior. Religious extremism. There are many examples.
Both likely covered by insurance. And stop smoking weed.