We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleDefining the Indefinable: Comments On SmithAuthorsAshton, HeatherPublicationAddiction, 2002, Vol 97, Issue 6, p756ISSN0965-2140Publication typearticleDOI10.1046/j.1360-0443.2002.t01-2-00060.x