What is the difference between toxic and poisonous substance

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Toxins are usually biological substances that are harmful to humans.
Poisons are usually chemicals which are fatal.

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Definition of Toxic and Poisonous
Toxic %u2018%u201C refers to the condition of a substance and the degree to which it can cause damage to you or any other organism or system. In colloquial usage, toxic can refer to biological organisms and non-biological substances, the latter in a more allegorical context.
Poisonous %u2018%u201C describes substances that will disturb organisms, usually in a harmful way. Poison implies a high level of toxicity, though any substance is technically poisonous if taken in a large enough dose. Poison always refers to biological organisms.