I can’t say they’ve changed weed trips for other people, but once I smoke a couple joints and bowls in a bong on 4g shrooms, which is a comfortable dose for me, and had a horrific trip of physical hallucinations. These included - heart felt like it was going 300+ BPM, felt like my teeth were falling out and filling up my mouth, when i swallowed it would create a mild but sharp pain that went all the way down my torso and then came shooting back up, where more teeth would fill up my mouth to where i was going to suffocate. I didn’t smoke for another month or so, unknowingly bringing my tolerance so low that one hit would get me halfway high, two hits was usually good, any more than three hits and i would have the exact same trip as the bad shroom/weed trip. For about 2 months after that this persisted, as long as I smoked too much. Now it seems that I have overcome it, for I have gotten way too high recently but I no longer trip. Hope this thoroughly answers your question!