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Certain brands of incense contain a chemical known as JWH-210, a pain-relieving substance and a form of synthetic marijuana. Karen Dobner of Aurora, Ill., lost her 19-year-old son, Max, when he was killed in a car accident while driving under its influence. He had purchased the incense over the Internet.

According to the Drug Enforcement Agency's Drug Fact Sheet, "purchasing over the Internet can be dangerous because it is not usually known where the products come from or what amount of chemical is on the organic material."

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