When I first started smoking and had absolutely no tolerance built up I had a few experiences bordering on hallucinations, some fairly vivid closed-eye visuals, definitely nothing as intense as LSD or mushrooms but comparable to a few days of sleep deprivation. I remember one in particular clearly, got baked out on the backyard trampoline alone at night looking at the stars and had a vision of an endless ice field, from beneath the ice burst the giant floating head of Rob Schneider covered in tribal tattoos with completely black eyes to swallow my soul. Gone as soon as my eyes opened thank god, and I haven’t had anything like that happen from weed alone at all as an adult. No family history of schizophrenia or anything else like it, but I do still have an abormally low tolerance for someone who smokes regularly, and my dad’s the same way, could be something hereditary.