In my limited history with people trying to sell me drugs, they're usually thwarted by my inability to understand WTH they're talking about.
I clearly recall an incident from the late 90s where someone stopped on their bike and asked if I was "looking for nugs", to which I responded, "What's a nug?". They rode on.
Similarly, someone just DM'd me out of the blue on reddit to tell me they "had a good plug HMU if you're interested". I didn't know what "HMU" meant, but after clarifying that it was "hit me up" I still didn't know what they wanted me to hit them up for until they explicitly offered me drugs.
This is just a long way of saying I'd make a terrible undercover narc, I guess.