Ugh, haven't you seen one of those breathing masks? The ones strapped to the chin and with a tube that goes into the nose. The girl poked her left nostril closed with her index finger while explaining. A lot of Maltese use those when not on Malta or in cardamine enriched atmosphere. I personally think they look way to stupid and attract way too much attention. As for excessive use - no, I think mainly outsiders use it extensively to get high. Eliza frowned for a split second. There are even a bunch of junkies on Barrier gate sneaking into the Maltese parts of the station every now and then to try and get high but the saturation in the atmosphere is too low for that. She paused. Only exception I can think of is that in space combat we use it in higher doses, kind of like a booster shot to improve concentration and reflexes.