Which is NOT a clue of poisoning?

Normal breathing is not a clue of poisoning because, in cases of poisoning, individuals often exhibit irregular or abnormal breathing patterns as their body reacts to the toxic substance. Poisoning can affect the respiratory system, leading to difficulty in breathing, rapid or shallow breaths, or other signs of respiratory distress.

In contrast, open drug containers, blue lips, and discoloration of skin are all potential indicators of poisoning. Open drug containers might suggest easy access to substances that could be harmful if ingested or inhaled. Blue lips can indicate a lack of oxygen, often associated with severe poisoning or respiratory failure, while discoloration of the skin might point towards specific types of poisons affecting blood circulation or oxygenation. Understanding these signs is crucial for quick identification and response in emergency situations regarding poisoning.