LOST: What Charlie did before the crash (1x02 Pilot)

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(Flashback)
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Charlie sits in his seat on Oceanic Flight 815, grimacing, sweating, and impatiently tapping his ring on his armrest. Cindy Chandler, a flight attendant, approaches him warily, asking him if he is okay. Trying to act calm, he politely tells her he's fine but becomes brusque when she presses him. She goes to the back of the plane and whispers to the other attendants about his behavior. Charlie becomes paranoid, glancing back repeatedly until he sees several flight attendants walking toward him. He flees his seat and rushes to the restroom, brushing past Jack and Rose and stepping over Boone and Shannon. The flight attendants pursue, but the captain turns on the "fasten seatbelts" sign, so Cindy stops her pursuit and alerts the passengers to fasten their seatbelts.

Charlie gets high in the bathroom of the plane.
Charlie finds a vacant restroom after several unsuccessful attempts. Once inside, he locks the door and removes his shoe, from which he takes a small bag of heroin. As soon as he ingests the heroin, a flight attendant knocks on the door and demands he come out. Charlie attempts to stall the attendant, and drops his bag of heroin into the toilet. As his finger rests on the handle, about to flush the toilet, the plane experiences severe turbulence, slamming him into the ceiling of the bathroom. after escaping the bathroom, he is nearly hit by a refreshment cart. Frightened, he rushes to a seat several rows back and straps himself in as the plane crashes.