Someone in US gave this plant to my friend who lives in Vietnam, to cure his cancer. It was grown in the US. What is this plant?
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It looks like kava, Piper methysticum, to me, or more likely Betel (Piper betle), due to the part where the leaf meets the leaf-stem. I could be wrong. I searched for cancer-curing plants, and it popped up. It looks like it. Whether it may help with cancer, I can't say, but there's probably a reason for the association, whether or not it's an all-out cure.
A plant an American sends isn't guaranteed to be an American plant, especially in the realm of alternative medicine.