In my campaign Major Po has a wide variety of narcotics in his various medical bags. He has a fairly relaxed attitude towards the use of various drugs when his troops are having some down time. It carries on the vibe set by the original unit commander, Major John Lynch. He was basically a drug abusing, alcoholic head case. Unsurprisingly he didn't survive the Poland part of the campaign.
As a GM I can describe the effects of various illicit drugs quite accurately to my players as I have tried just about everything myself. Of course some of my players don't need descriptions of effects as they know them well.
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 "It is better to be feared than loved" - Nicolo Machiavelli
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