The first source is a series of comments left on a YouTube video that compares the deadliness of heroin and cocaine. Many commenters share their personal experiences with drugs, including their struggles with addiction and their opinions on the dangers of various substances. The second source is a transcript of a YouTube video that explores the effects of cocaine and heroin on the nervous system and the dangers of mixing the two. The video explains how each drug affects dopamine and other neurotransmitters, resulting in their distinct effects on the body. The video also discusses the risks of overdose, particularly with the combination of these drugs, known as a “speedball."

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