The closed workshop, for which people must register, will follow a free public meeting on Thursday.

Dr Nitschke said he planned to:

Demonstrate a nitrogen system that was pain-free and undetectable.

Detail a drug testing process of substances that are being imported into Australia.

Explain the legal ramifications around voluntary euthanasia.

It is the first time that Dr Nitschke has visited the state since he spoke in favour of euthanasia at an August debate in Launceston to a capacity crowd. "We still think Tasmania is the most likely state to see legislative change on this issue,'' he said.

Premier Lara Giddings and Tasmanian Greens leader Nick McKim are still drafting a co-sponsored euthanasia bill.

The previous bill, proposed by the Greens, was defeated by 15 votes to seven in 2009.

Mr McKim and Ms Giddings confirmed yesterday that a discussion paper on voluntary euthanasia legislation would be released within the next few months.

Gwynneth Williams is the Northern Tasmania co-ordinator for Exit International, the organisation set up by Dr Nitschke.

She said there were 20 Exit members in the North and 30 in the South.

"Generally, those people fall into one of two categories: those who are passionate in general about the movement and those who have a serious illness and are looking for information that may assist,'' she said.

John Paull, of Lanena, joined the group about four years ago. The retired anaesthetist said that in most cases information on voluntary euthanasia was only used as a comfort to the sick and dying.

The public meeting starts at 1pm at the Adult Education Centre, 51 York Street, Launceston.