Comment: Does anyone remember spraying

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In reply to comment: Here's another one for you (see in situ)

Does anyone remember spraying

of Mexican marijuana fields with paraquat by the US Government about 35 years ago? It caused permanent lung damage to many American marijuana smokers, as well as making many of the Mexican workers who handled it very sick.

http://www.nlm.nih.gov/medlineplus/ency/article/001085.htm