non-using1
/nɒnˈjuːzɪŋ/noun
= non-use.
Origin
Mid 16th century; earliest use found in John Frith (1503–1533), evangelical theologian and martyr. From non- + using.
non-using2
/nɒnˈjuːzɪŋ/adjective
That is not using or does not (habitually) use something; specifically that does not (habitually) use a drug.
Origin
Early 20th century; earliest use found in The New York Times. From non- + using, participial form of use.