As far as I know what you are smelling is particles that enter the nose and attatch to the smell recepticals in the nose and which then gets processed by the brain so I dont think that breathing back out for someone else to smell it would work.

Please someone correct me if I am wrong though.

lol, i imagine you came to last word after everyone you knew refused to help with your 'experiments' :)

The components of the odor trigger specific nerve endings in your nose by binding to cell surface receptors and thus trigger a recognition response from your brain.  The amount of components that are contained in air that you breathed in have to be in a sufficient part per million to trigger the nerve cell.  Once you breath out those components (only those that did not bind in a cell surface in your nose), the chance of your exhalent containing enough components to trigger someone else's odor detection process would be low.