Can graveyard trees can cause hallucinations?

My friend told me about certain trees causing hallucinations, specifically a certain tree usually found in graveyards though I cant remember what Its called, something like a yew tree or a lye tree? Anyway she explained that Is why people always complained they saw ghosts in graveyards because the trees caused... show more My friend told me about certain trees causing hallucinations, specifically a certain tree usually found in graveyards though I cant remember what Its called, something like a yew tree or a lye tree? Anyway she explained that Is why people always complained they saw ghosts in graveyards because the trees caused hallucinations. Can someone explain more about this and why these trees can cause these hallucinations?
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