GMMAT, my friend... Don't think we're saying you can't hunt if the wind isn't directly in your face. You can hunt with the wind in either ear too (crosswind). In many cases, you might have to set up so the wind is quartering. Set so that the scent is blowing in the direction that it doesn't cross the path where you expect the deer to be coming from, but crosses their path beyond you into the area they are going to. Sometimes they'll reverse and come right back to you when they catch your scent.

You just never want the breeze directly at your back if you can possibly help it.

You can't forget vertical air currents either. Air that's warming up rises, so in still conditions or very light wind in the morning you want to be higher than the deer. Treestand or up on a hillside. Air that's cooling off sinks, so in the evening you want to be down lower and look for deer that are up on the hillside. In those cases, if you have to set where the wind is at your back, it's not quite as bad. Or, again, be crosswind or have it quartering away from where you expect the deer.