 2. Nasal lining fluid absorption nasosorption or SAM: A small strip of absorbent material, that looks and feels like soft tissue paper, will be used to absorb moisture from the inside surface of the nostril. The special absorptive paper will be placed inside the nostril and left for a period of 2 minutes to absorb the nasal lining fluid before being removed, gently sucking up fluid like blotting paper. Putting the paper into the nose can tickle, and cause your eyes to water a little. However, the nasosorption does not hurt and the investigators method has proved to be well tolerated in babies, children and adults. The paper absorbs the nasal fluid and many substances produced by the nasal cells can then be extracted from the paper and measured in the laboratory. 