Seriously, winter here means rain and lots of it. On those cold, rainy days I have noticed that hogs will move off and on all day long with big boars moving way earlier in the evening than usual.
They will also bed down in more open cover and not way back in the thickest of the thick as they usually do. They will still visit their wallow holes even when frozen over they will root it up to break the ice and wallow away, dont know why but that they just do.
When it comes to scent, there are basically two types; those that attract and those that mask. I've tried both on many occasions. There are lots and lots of "doe in heat" scents, designed to attract a big buck into range. I've also used a "cow in heat" scent while elk hunting.
Another scent would almost be better named as a "coverup smell". The main goal is to cover up human odor or mask it. Though I don't believe you can ever totally eliminate all human...