[klodolph]

For questions like these, I would start with the MSDS. While the MSDS doesn't always answer your questions, they tend to be reasonably conservative relative to typical use. For example, they sometimes recommend safety gear that people ignore.

Keep in mind that isopropyl alcohol is available at different concentrations, and the different concentrations have different MSDS. Here are the hazard / precautionary statments from the MSDS:

H335 - May cause respiratory irritation P261 - Avoid breathing mist, vapors, spray. P271 - Use only outdoors or in a well-ventilated area.

Note that "avoid breathing mist, vapors, spray" is not an especially strong statement.