I'm assuming that LT is asking everyone if they smoke pot to either show that none of them really 'believe' it can be used in moderation since if they did they would be using it, or to argue that their lack of experience with it shows that they don't know what they're talking about.
In my experience very few if any SSPX priests (that's where I go) can guide young people in matters of MJ, alcohol, self-abuse, pornography and pre-marital relations, because they have no personal experience whatsoever. That is why I see the young people leave and go into the world as soon as they are able. That is what happened in the 1960's when 80% of Americans went to mass and the Novus Ordo did not exist. The priest didn't have a clue how to deal with it. I see women counselors who never had any children, giving lectures about how to raise children, and college professors who have never had to use their theories in the real world, teaching students . They are only good for teaching those that know little, like children. "In the country of blind men, the one eyed man is a king".
If you have not smoked pot you can't know anything but what you read. If you have friends who smoke pot, that is one way to learn about the effects by seeing them and how they live. Do you have any experience with relatives and friends who smoke pot?