I'd venture to guess that the ozone that these printers (and moreover bigger photocopiers) emit is worse for you than the minute amounts of toner they spit out.

Fact: Toner is statically charged plastic powder. If it were coming out of the printer in any sort of volume, enough to be harmful at all, it would collect all over the printer and its surroundings in a sooty mess. Most people don't scrub up around their print station, so you'd see it after a week or so.

If you're dealing with toner, wear gloves if you can. If you get some on you, wipe it off with a dry cloth first, then cold water. If it gets in your clothes, same thing. It mostly just brushes off and needs heat to do anything. Don't breathe it in, don't leave empty cartridges laying around. Most companies have recycling programs for the empties.