The numbness caused by eating spicy neck has nothing to do with poppy. Spicy neck is a spicy food, which is made of pepper and various seasonings. The spicy taste of pepper comes from capsaicin, which interacts with the receptors of neurons, leading to the spicy feeling of pepper food. When eating pepper, nerve receptors will transmit spicy stimulation signals to the brain. This kind of stimulation may lead to local numbness or irritating feeling. If you feel numb after eating spicy neck, it may be because pepper stimulates your nervous system, not related to poppy. However, if the food you eat contains poppy or related ingredients, it may cause other discomfort or illegal problems.