Timing of drug test for full time role

Got a full time offer for a PE firm (think KKR/Blackstone/Carlyle). I heard from an analyst there that they didn't drug test for full time. However, I'm still pretty paranoid and am planning on quitting in case they do. I currently smoke every night to help me fall asleep. My question is--when do drug tests usually occur? Been looking at other posts here and I can't tell if I should start quitting 30 days before the start date or even further in advance, if they'll make me take a test a few weeks before I start. Never been drug tested before for any internship. Thanks!

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