... - vomiting, sweating, tremors, even hallucinations that continue until the body gets used to being without the drug. How Can You Tell if Someone is Using Drugs? Here are some of the more common warning signs of someone who is using drugs: Stops showing interest in ... Hallucinogen - A hallucinogen is a drug, such as LSD, that changes a person's mood and makes him see, hear, or think things that aren't really there. High - A high is the feeling that drug users want to get when they take drugs. Inhalant - An inhalant is sniffed or to give the user an immediate rush. Narcotic - ... on dev...

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