Mescal Cactus

Mescal Cactus: A very small round cactus that causes hallucination. It grows in Sandora Desert.

Luffy ate one instend of the Lizard Meat, without thinking twice. After eating it, Luffy felt like he's drowning and nearly attacked his crews. Chopper knows about and with his quick thinking, he tranquilize Luffy to sleep, which wears the effect out.