The term snuff was respondent-defined. The 1987 Field Representative's Manual provided a definition of snuff, as "a smokeless tobacco product that is either inhaled through the nostrils or placed in the mouth between the cheeks and gum or under the tongue. A common term for snuff use is "dipping." It added that this definition was for the interviewer, and the term snuff should be defined for the respondent only if questioned. The 1992 Field Representative's Manual also mentions that using snuff includes sniffing it and placing it in the mouth.