Stephen Pudney, "Keeping off the Grass? An Econometric Model of Cannabis Consumption by Young People in Britain", Journal of Applied Econometrics, Vol. 19. No. 4, 2004, pp. 435-453. The data used in this paper come from the 1998-9 Youth Lifestyles Survey (YLS), and the property of the Home Office (a UK government department). The YLS was conducted between October 1998 and January 1999 for the Home Office by Social and Community Planning Research (SCPR - who changed their name to the National Centre for Social Research - Natcen - in May 1999). The survey design was shared between the Home Office Research Development and Statistics Directorate and SCPR. The aims of the survey were primarily to investigate offending amongst young people and how this differs by lifestyle and demographic factors and to look at the way the pattern of offending changes with age. The dataset contains questions on a number of lifestyle and criminal justice topics. Since th Home Office does not permit open access, the data cannot be lodged here. The data are held at the ESRC (UK) Data Archive (http:www.data-archive.ac.uk), to whom enquiries concerning access should be addressed. The YLS dataset is catalogued at the data archive under "study number" SN4345. Only those respondents who were interviewed about drug use via computer-assisted self interviewing (CASI) were used in the analysis. A few individuals with missing values for key variables were deleted prior to the analysis. These deletions are described in the paper. Steve Pudney steve.pudney@le.ac.uk