well..... many chemotherapy drugs are really “poisons” (starting with mustard gas derivatives in WW2) ...designed to attack dividing cells...
but they are still poisons ... the trick is that they attack the rapidly-dividing cancer cells more than regularly-dividing healthy cells.... its a careful game....
sometimes.. SUCCESS!!! happy patient, living patient. sometimes, though...... well, see the article...
More than chemo drugs are poisons. Many drugs are poisons. It depends on the dosage.