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...psychedelic substance, [[THC]], which contains no nitrogen and is not an [[indole]], [[phenethylamine]], [[anticholinergic]] (deliriant), or a [[dissociativ ...eft">''[[Acer saccharinum]]'' (Silver Maple Tree) was found to contain the indole alkaloid [[gramine]] (not active and extremely toxic) 0.05% in the leaves,

...a tar that can be swallowed. Kratom is not often smoked due to the active alkaloids being destroyed by the heat.{{Citation needed|date=May 2010}} ...sine]] (best known from ''[[Rauwolfia serpentina]]'') and some [[yohimbe]] alkaloids such as [[corynantheidine]].{{Citation needed|date=May 2010}}