Smoking is banned in prisons, but that has not stopped some inmates trying to get their nicotine fix.
In the 10 months after the ban was introduced, Corrections staff reported made 2031 discoveries of tobacco and smoking equipment in New Zealand's 21 prisons.
Figures obtained by the Herald under the Official Information Act show a 17.3 per cent decrease in the number of smoking-related contraband incidents between July 1 last year, when the ban started, and last April.
Waikato's Waikeria prison topped the list, with 246 incidents in the 10 months, followed by Christchurch Prison with 193 incidents, Hawkes Bay prison with 173 and Rimutaka prison in Wellington with 171.
Staff at the country's women's prisons found far less contraband. Seventy-two incidents were reported at Auckland region women's corrections facility, 61 at Christchurch Women's Prison and 30 at Arohata prison in Wellington.
In the first month of the ban, 208 incidents were reported nationally. This dropped to 172 in April.
January had the least number of smoking-related contraband finds, with 152 incidents recorded.
Smoking-related contraband includes tobacco, cigarettes, filters, cigarette papers, matches and lighters.
Prison Services general manager Jeanette Burns said that in most cases, contraband items were found on inmates or visitors before they entered the prison.
The start of the ban followed a year-long campaign to help prisoners quit smoking.
The information also showed that in June 2010 when that campaign started, about 5600 prisoners making up 67 per cent of the prison population, smoked.
"By the time the ban was implemented, all prisoners had been assessed, and the majority had taken up nicotine replacement therapy (NRT)," Ms Burns said.
She said that between November 1 and May 22, 8038 new prisoners were questioned about their smoking status and 70 per cent said they were smokers. Of those, 4177 prisoners elected to start NRT.
"All prisoners are questioned about their smoking status as part of their reception evaluation. If identified as tobacco smokers they are assessed for and offered NRT in the form of patches or lozenges," said Ms Burns.
NRT is funded by the Ministry of Health and no cost is incurred by the Department of Corrections.
Last month Corrections Minister Anne Tolley said $65 million had been "reprioritised" to expand drug and alcohol treatment in prisons and the community.
The funding would enable Corrections to treat 33,100 more offenders with addiction problems.
She said the first year of the smoking ban was a "real success" and staff and inmates had seen great benefits.
"Safety is much improved, with offenders no longer having access to lighters and matches. This has meant a 72 per cent reduction in fire-related incidents."
"It has also removed the opportunity for prisoners to use lighters to melt plastic into dangerous weapons."
Air quality had improved and the threat of harm from passive smoking removed.
Prisons with highest number of finds:
* 1 Waikeria prison - 246 incidents
* 2 Christchurch prison - 193
* 3 Hawkes Bay prison - 173
* 4 Rimutaka prison - 171
* 5 Spring Hill corrections facility - 163
* 1 Auckland region women's corrections facility - 72
* 2 Christchurch women's prison - 61
* 3 Arohata prison - 30
Prison with lowest number of contraband finds
* Wellington prison - 14.