I never wrote, that you get hallucinations from thc, but thc is a drug, and also a hallucinogenic drug.
1. Stimulants ( tee, tobacco, speed, meth, coca, ecstasy )
2. Opiats ( O, H, M, synth. opiats )
3. Hallucinogenics ( THC, Mushrooms, lsd, 2 cb, mda... )
4. Dissoziative´s ( Ketamin, DXM, PCP...