producing  cigarettes in the envelope in order for the smoke to set off the  fire alarm, but at no point in the film it is revealed why smoking  inside the office was not supposed to set off any alarm (otherwise  the agent would have stepped out, wouldnt he?). In fact, in a  previous scene Michael is glad to be offered a "regular" cigar  during his private meeting with Rethrick (Michaels reaction being,  "Now youre talking.") as the cigarettes of the time normally dont  produce any smoke and are therefore probably less enjoyable. Michael  had made sure to include a pack of "old