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Because he has a mask on that is continuously dispensing beyond lethal doses of poisonous gases into his body. The buildup of gases over time is far greater than it would be from just a moment of exposure. When he removed the mask, he instantly powered back up and regardless it will not affect Pochita's body much or at least not his regeneration, as it can deal with cancerous dura neg and biology change,where was it stated the exposure had to be continuous. even so yujis blood is posionus by default so if denji keeps eating it its gonna hurt him