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Origin
Travelers from Tahiti brought the lei custom to Hawaii in the early 20th century. When Hawaiian tourism became prominent, the custom began to be known as distinctly Hawaiian.
Early Leis
Early leis weren't made only from flowers. Leaves, shells, bird feathers, stones and even animal bones were used.
Wearing a Lei
Leis are traditionally worn around the neck. Formal leis can have accompanying wrist pieces. While leis were originally presented to the bearer with a kiss, that custom has gone by the wayside because of changing social norms. Leis are normally presented with a short bow and a smile today.
Disposal
It is considered disrespectful to throw a lei in the trash. Rather, remove the string so it won't harm wildlife, then bury or burn the flowers or scatter them on land or in the sea.
Today
Leis are rarely given to newly arrived visitors by airlines today; however, many hotels still continue the practice. In contemporary Hawaiian culture, leis are normally reserved for semi-formal engagements and important celebrations, including weddings and funerals.