I dunno I've done a ton of hallucinogens alone in my time, and I have always maintained a level head to not do anything dangerous. The most dangerous situation I was in while tripping was the salvia I described earlier, the lighter I was holding I'm pretty sure I kept sparking it over and over and over and was staring at the flame during my trip. But I was outside near nothing flammable so who cares. I guess most of the time if I am able to physically move myself then I know I am tripping. Otherwise when I am so far in I can't move and don't know I'm tripping doesn't matter won't be able to hurt self in paralyzed state.