These chemical weapons affect a victim's central nervous system. AdvertisementIran has developed chemical weapons based on synthetic opioids such as fentanyl, warns a US expert, powerful agents that could incapacitate soldiers or civilians when added to grenades or artillery. (The US, in contrast, completed the destruction of its chemical weapons in 2023.) Nonetheless, chemical weapons do have a frightening aura, even if fentanyl gas is nowhere near as deadly as nerve gas. "I think that many, many people would see it that way because you're talking about chemical weapons," Levitt said.

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