After two years of this pandemic we've gotten the hang of a few things, like wearing a mask in crowds and washing our hands frequently.Vaccines and boosters are here. Testing is more available — though rapid tests can still be hard to find in some parts of the country.And yet, the vastly more infectious omicron variant has thrown our COVID routines into disarray. The situation seems to change so fast it's hard to figure out which activities are safe on any given day.It might be time to draw up a new "risk budget", according to Leana Wen, an emergency physician and public health professor at George Washington University.