Final answer:
Addictive drugs have reinforcing effects that contribute to compulsive use, despite negative consequences. They can also lead to physical or psychological dependence and tolerance.
Step-by-step explanation:
The key property of addictive drugs relates to their reinforcing effects. Addiction refers to the compulsive use of a drug despite negative consequences, and the rewarding and positively reinforcing effects of drugs contribute to this compulsive behavior.
Additionally, sustained use of addictive drugs can lead to physical or psychological dependence on the drug, as well as the development of tolerance.