The Global Drug Survey 2014, conducted in partnership with Fairfax Media, found that, of the 5646 New Zealand participants, 13.7 per cent of respondents had in the past year taken drugs, including alcohol, less than two hours before starting work.
A further 13.8 per cent had done so, but not in the past year.
One industry where illicit drug use was reported to be common was farming.
Warrick Cocker, who works on a small south Wairarapa dairy farm, said he knew of a farm where workers grew their own marijuana, but they got the job done so their boss did not care.
A 29-year-old man, who did not wish to be identified, reported that he showed up to work stoned every day for five years while he worked on farms in Waikato, Canterbury and Southland.
“There’s only three or four people working on a farm, and there’s always been one person who had weed,” he said. “We’d just get real high and do our work. This isn’t like a little bit of weed, this is smoking three or four times, every time we come back to the house for a break.”