coffee beans, tea leaves, cocoa beans, guarana and mate.

Is tea and coffee intoxicant?

Tea contains a poisonous substance called tannin and coffee contains a poisonous substance called caffeine.

What plants contain caffeine?

Caffeine is an alkaloid occurring naturally in some 60 plant species, of which cocoa beans, kola nuts, tea leaves and coffee beans are the most well-known. Other natural sources of caffeine include yerba maté, guarana berries, guayusa, and the yaupon holly¹.