Others are chosen for their smell. Generally, herbs come from the green leaves of plants or vegetables.

VOA: special.2009.05.19

For example, the insects can smell carbon dioxide in the breath of a person or animal from as far away as sixty meters.

VOA: special.2009.05.26

Others are chosen for their smell. Still others were used traditionally for health reasons.

VOA: special.2010.06.01