A poisonous mixture refers to a combination of substances, where at least one component is toxic, and the overall blend can cause harm or death if ingested, inhaled, or absorbed into the body. The toxicity of a mixture can be greater or less than the toxicity of its individual components, depending on the specific substances and their interactions. Link
Even when you mix substances together that are not harmful, the chemicals in the substance can mix up and create a poison. So, in the event of mixing up some substances, you can create a poison or perhaps something harmful to the body.
So, carefulness is required in taking in substances and mixing things especially for consumption.
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