Most disassociatives like nitrous can cause hallucinations but they are more of an intense dreamlike state than what lsd causes. With LSD hallucinations you ar

Most disassociatives like nitrous can cause hallucinations but they are more of an intense dreamlike state than what lsd causes. With LSD hallucinations you are very much still present in the world even if you interpret things in a strange way. With the kinds of hallucinations you have with disassociatives you may be partially conscious but you aren’t present in a meaningful way. I have a vivid memory of a ketamine trip where I was physically in a hotel room but mentally I was flying through some alien crystalline planet. I was awake and apparently talking to people but it was definitely not the same as a psychedelic hallucination. LSD hallucinations are more like the deep dream images where you have more or less correct sensory input, but anything that looks vaguely eye-like, for example, your brain can’t help interpreting it like an actual eye. The way your brain builds a model of reality just becomes broken and you make all these connections between things that are not normally connected.