While at the airport we noticed this sign. Chewing of betel nuts is very common on the island for both men and women. The betel nut grows wild on a palm tree. The nut is chewed with a mixture of lime made from ground clam shells. The resulting combination products a very red saliva that is constantly spit on streets and sidewalks. The juice also stains teeth bright red and is a major cause of lip and gum cancer and rotten teeth. The nuts are sometimes mixed with tobacco to enhance the effects. It is a habit akin to tobacco chewing and smoking and is very difficult to quit.