Pure Black Betty genetics, i.e. 100% South African Durban landrace, is pretty much the most psychoactive weed on the planet. There are strains, such as LSD, Durban, Sensi Star, that exhibit unusually strong psychoactive effects as a genetic trait, and are valued highly by growers and patients alike for their potency.
However, it's relatively impossible to get true hallucinations from smoking marijuana. The effects are too minimal to achieve CEV's, and any psychoactive effects usually manifest themselves in body activity.
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