Oh no, it's a very bad idea to inhale Canned Air. Canned Air (or, more technically, "Compressed Gas Duster") is typically made of either difluoroethane or tetrafluoroethane—either of which is Not Good For Your Health™ when inhaled. It can do some simple asphyxiation, could probably poison you, and if you're not careful you could end up spilling some of the compressed liquid out—freezing your mouth and lungs. Avoid such actions.

A side note, I prefer tetrafluoroethane to difluoroethane, as its chemical stench is, for some reason, not nearly as strong.

200th node! Rock over London, Rock on Chicago!