Samsung SL-M4075FX/SEE User Manual page 342

Printing problems
Condition
Before printing, the Using damp/wet paper can cause vapor [white
machine emits vapor near smoke] during printing.
the output tray.
The machine does not Paper size and paper size setting do not match.
print special-sized paper,
such as billing paper.
The printed billing paper The paper type setting does not match.
is curled.
Possible cause Suggested solutions
This is not a problem, just keep printing. If you are bothered by the smoke [vapor], then
replace the paper with fresh paper from an unopened ream.
Set the correct paper size in the Custom in Paper tab in Printing Preferences (see
"Opening printing preferences" on page 64).
Change the printer option and try again. Go to Printing Preferences, click Paper tab,
and set type to Thin (see "Opening printing preferences" on page 64).
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6. Troubleshooting