Nothing smells better in the morning then Roasted Coffee Beans. Do you enjoy coffee? 
I do, but i was wondering where they originated.  Coffee makes me jittery.
It was a native plant to tropical Africa and then exported. 
hhmm so ethiopia and kenya. Very interesting.  Coffee is now grown in Columbia, as well as all around the world near the equator.  Did the Spanish bring coffee to Columbia?
Don't forget about Madagascar, the Comoros, Mauritius, and Réunion in the Indian Ocean.
Very perceptive of you.  I guess there are many plants that contain caffeine?
Mainly two plants the arabica, and the less sophisticated but stronger and hardier robusta.
In coffee plants, yes.  Wait a tic! Don't plants use caffeine to ward off pests?  Kind of a natural pesticide?  We drink this poison?
If you have ever had a soda you have drink poison. Roasted coffee beans that are ground and brewed are the least of your worries. 
Ok.  You are a very knowledgeable person.  Way to go!  You tell me something about it, I see i can't stump you.