Example sentences of "have [been] [v-ing] heroin for " in BNC.

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1 As in the first survey , over 90 per cent of the opioid users attending Wirral 's main two facilities for drug users were daily users of heroin , and had been using heroin for between six months and five years .
2 As in the first survey , over 90 per cent of the opioid users attending Wirral 's main treatment facilities in 1985–6 were daily users of heroin , who had been using heroin for between six months and five years .
3 Consequently , the sample group had been using heroin for an average of five years when they were interviewed .
4 Given that most of the interviewee group had been using heroin for between four and five years , most had contacted their GP , and frequently several different GPs , on a number of occasions .
5 Second , almost three-quarters of these interviewees had been using heroin for two years or less by the start of the prevalence study period .
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