Enclose the food in a food storage bag, leaving some empty space, and seal the bag most of the way, leaving a small opening at the top through which to insert the nozzle of the smoke infuser. Press the bag to remove as much air as possible—this ensures that more smoke, not air, comes in contact with the food.
If you are using a bowl or dry storage container, place the food inside and cover the vessel tightly with a double layer of plastic wrap. You won’t be able to get the extra air out, so the results may not be quite as intense as if you were using a bag. Punch the nozzle of the infuser through the plastic wrap to make an entry point for it. Remove the nozzle to clear its opening of any plastic wrap that might have gotten stuck in this process—if the opening is obstructed, smoke will flow back through the machine instead of out through the tube.