To dream of smelling something reflects your feelings or gut instincts about something. Bad smells reflect distaste for a situation, bad feelings about something, or gut instincts that something wrong. Something may not feel right. Feeling that something is wrong.
Good smells reflect positive feelings about a situation or person. Your gut instincts feel that something is good.
Consider the object you are smelling for additional symbolism.
Example: A woman dreamed of being on a smelly train. In waking life she was put on a special diet that she didn't like and didn't feel would work at all. The bad smell may have reflected her distaste and bad feelings about the diet.
*Please See Stinks