@ruthschaefer15: It should be noted that in the global and American markets, methamphetamine is still the most smoked, and fentanyl replaces heroin. Methamphetamine is the product of chemical synthesis by Lao Bai in the American drama "Breaking Bad". It is the second generation of drugs, and its effect is excitement and hallucinogenic. Fentanyl is the third generation of drugs, and its effect is potent analgesia, sedation and inhibition of respiratory center. Outside the United States, "skating" is the absolute mainstream, fentanyl is not popular. One reason is that countries are cracking down hard, drug dealers think the risk is too high, and fentanyl mainly attacks the US market; the more important reason is that the "authentic" effect of drugs is the excitement of methamphetamine.

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