thats shitty. I always feel if you've told one person, you've told everyone. If you cant force yourself to get rid of them, i would definitely start spreading the rumor that they died. Or I would invite that guy over for another smoke session, and very politely, but firmly explain how he needs to not tell anyone. Explain all your risks, how even random people can become problems. Really make him understand the gravity of the situation. You make it sound like he's pretty untrustworthy however, which is unfortunate.

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