Interesting short video on Japanese opium laced cigarettes in WWII. Probably not what you think, but very ingenious on their part. Watch the video and find out!
Side note, the producer of this video, Forgotten Weapons, does a lot of neat videos on weapons from different periods. He often takes them to the range to shoot and has used some in shooting competitions. If you like weapons, check out his other videos.
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It's remarkable the myriad interests people have within different verticals that exist in war histories.