Commonly abused drug in many parts of the planet. Cannabis is a commonly abused drug in many parts of the planet. Also known as marijuana, it comes in different forms: dried leaves, buds, stems, and oil. It is usually smoked, and it gives off some sort of scent and triggers a relaxing, powerful, and potent high. People who become addicted to cannabis may experience the following changes in their behavior: memory problemspoor learning skillsdistorted perceptiondifficulty in ...