Smoking will be banned in all prisons in Wales and four in south-west England from next year, the government says.
This will begin a phased roll-out that will eventually see all jails in England and Wales go smoke-free.
And from next month, smoking will be barred inside buildings at all "open" prisons in England and Wales.
The Prison Governors Association, which supports the ban, said it would monitor this initial phase to ensure stability and safety were maintained.
A smoke-free policy will be implemented in all prisons in Wales - Cardiff, Parc, Swansea and Usk/Prescoed - from January 2016, and at four English prisons - Exeter, Channings Wood, Dartmoor and Erlestoke - from March 2016.
Smoking is currently allowed only in prison cells and exercise yards, but the government eventually intends to ban smoking in all 136 prisons in England and Wales to reduce health risks.
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