Cocaine: A strong stimulant derived from \Erythroxylum coca. It increases dopamine levels. Standard biology textbooks (e.g., NCERT) specifically state that "Excessive dosage of cocaine causes hallucinations."
Morphine & Heroin: These are opioids/depressants. They slow down body functions and act as analgesics or sedatives, not primarily as hallucinogens.
Ganja (Cannabis): While cannabinoids are known hallucinogens, the specific phrasing "Excessive consumption... causes hallucinations" is the classic textbook description for Cocaine toxicity.
Step 2: Conclusion:
In the context of competitive exams and standard texts, Cocaine is the intended answer for drug-induced hallucinations at high dosages.