Quote
"All things are poison and nothing is without poison; only the dose makes a thing not a poison."
"While Fell was reposing himself in the hay, A reptile concealed bit his leg as he lay; But, all venom himself, of the wound he made light, And got well, while the scorpion died of the bite."

In science, a poison is any chemical substance that is harmful or lethal to a living organism. The term of poison is used in a wide range of scientific fields and industries, where it is often specifically defined. It may also be applied colloquially or figuratively, with a broad sense.
"All things are poison and nothing is without poison; only the dose makes a thing not a poison."
"Son, I dont have money even to buy poison. Please help –"
"Vipera Cappadocem nocitura mormordit; at illa Gustato peril sanguine Cappadocis."
"Hier auprès de Charenton Un serpent morait Jean Fréron, Que croyez-vous quil arriva? Ce fut le serpent qui creva."
"Belladonna, n.: In Italian a beautiful lady; in English a deadly poison. A striking example of the essential identity of the two tongues."
"Whats one mans poison, signior, Is anothers meat or drink."