With Christmas around the corner I'm getting lots of questions from my users if they can give each other gifts of gadgets that connect to their USB ports for power. The "hot" one this year is heated mittens that plug in to the USB port. I have not previously set a policy on this and would rather not globally disable people's USB ports. Can anyone weigh in on if allowing users to power such devices like these, mini fridges, massagers, vacumes, etc., etc. cause any damage from constant use or should I just be more open minded? I hate to be a crab but I hate to also fry a couple hundred power supplies just so folks have something to put in their Christmas stockings!
If you think there is a negative impact and can cite a reference that would be great.