Final answer:
Poison is a harmful substance that can cause toxicity in small quantities. Controlled substances are drugs regulated by laws, classified by harmful or addictive qualities. Toxins are harmful substances with potentially fatal effects on health.
Explanation:
Poison is a substance that can cause toxicity in small quantities when absorbed into the body. Controlled substances are drugs regulated by state and federal laws, classified into different schedules based on their harmful or addictive qualities. A toxin is a harmful substance that can have potentially fatal effects on an organism's health.
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