A stand-off between 40 inmates at Hobart's Risdon Prison has been blamed on a decision by authorities to phase out nicotine patches for convicted smokers.
The incident was sparked when the prisoners refused to return to their cells, before some eight hour later on Wednesday night.
Tasmania Acting Minister for Corrections Guy Barnett said there will be a full investigation.
"But I am advised that prisoners cited the phasing out of the nicotine replacement program as justification for their actions," he said in a statement.
Risdon Prison banned tobacco from the jail two years ago.
No staff were injured. One prisoner suffered a minor cut.