If you give INFJ a 'real' hug they would forgive everything you've done wrong to them.
If you give INFJ a hug they would smile and befriend you, eventually rub you back.
If you give INFJ an unexpected hug they would feel overwhelmed with a strange mix of happiness and disconfort.
Sadly, almost no one wants to give INFJ a hug.
If it is a real hug out of affection, the affect on your psyche will last far longer then the hug will ever hope to.
If it is a normal hug they will either be awkward and uncomfortable or calm and enjoying the hug as will you.
My friends always tell me I give the best hugs even though sometimes I am uncomfortable with it >.<