I do agree with Dr Singh.....
But, Have you actually confirmed that there is a odor? Do other people smell it? There is a syndrome called phantosmia that describes a situation where an individual perceives an odor that does not exist... this can be caused by certain health issues.
Cigarette smoke and other burning items are among the most common smells in this disorder.
Here is a link to read what others have experienced:
Phantosmia can occur for several reasons... sometimes it occurs as a result of a head injury, an upper respiratory infection,temporal lobe seizures, sinusitis, brain tumors, migraine , Parkinson's disease and stroke. The accompanying symptoms are common as well.. if someone smells smoke, their eyes may actually burn.
While it is likely NOT serious, phantosmia can be an indication of a serious illness. I would recommend you see your Doctor for an examination, he will be able to run some tests to rule out serious causes and prescribe a treatment to give you some relief. In the mean time try using some lavender or peppermint drops ( available in health stores) on a hanky and sniff it lightly... this will immediately stop the odor. I hope this helps you. Please let me know if I can help you further:-)