They say that devil fruits come from trees like the gum gum tree, and if so is it possible for Luffy to meet another person with the gum gum power?
What if a human ate the human human fruit that Chopper ate? What are they able to do if they did?
Since everybody is mocking you, I'll just answer the questions, so you can at least read them before the thread gets locked…
The answer is from Oda himself:
1 - Excuse me!! May I pose a serious question to the typically-vulgar SBS?? In Volume 46, Usopp said that the same power doesn't exist twice. But this doesn't make sense with what you said in the Volume 45 SBS... If the Gomu Gomu Fruit was in a book of fruits, then Luffy HAD to have eaten at least the SECOND known example of the fruit! Now, most beautiful and intelligent Ei-chan, explain it all! ✩ P.N. Takafi
O: Very sharp of you. But I'm cool. I haven't made any mistakes. As a hint, let me rephrase what Usopp is saying. "The same powers don't exist twice AT THE SAME TIME." How's that? For more detail, you'll just have to wait for a certain professor to make his appearance in the story, and explain exactly what the Devil Fruits REALLY are... Eventually.
2 - R: WHAT HAPPENS IF A PERSON EATS A HITO HITO FRUIT?
O: I suppose I should say they "BECOME HUMAN". Uh, I guess you could say that means like becoming an adult, or finding your true spirit or something. So basically, people will live more human-like. Well. I guess you could say that. Or not. Basically, not. Goodbye. (runs away)