One of WA's new conservative Upper House MPs will use his position to push back against the "nanny state", as he seeks to legalise cannabis and e-cigarettes, the use of tasers for self-defence, and the relaxing of laws around paintballing.

Liberal Democrat MP Aaron Stonehouse has no political experience — at 26, he has spent most of his working life in retail.

But his journey to the Upper House as the Member for South Metropolitan Region has been swift, and his agenda is clear.

"I'll be representing the Liberal Democrats' values, those being small government, low taxes and individual freedom," Mr Stonehouse said.

"Young people know how best to live their own lives.

"They'd rather not be having big daddy government telling them what to do every day."

The new MP said he would push for civil liberty in what he described as a "nanny state".

"The major parties in Western Australia seem to believe that if you smoke, drink, gamble, vape or buy your kids a happy meal that somehow makes you a bad person," he said.

"[The Liberal Democrats] are pro-choice. We believe in allowing people to make their own choices about what they do with their own bodies."

Jailing drug dealers 'essentially attacking non-violent crime'

Mr Stonehouse will use his maiden speech in Parliament today to outline his agenda, which includes abolishing trading hour restrictions at venues selling alcohol and relaxing smoking laws.

"When smoking is banned indoors, irrespective of the views of a private property owner, I think that's an overstep of government," he said.

Mr Stonehouse is one of five conservative Upper House MPs that now hold significant power in the chamber, with Labor needing external support to pass legislation.

But he has denied he was part of a powerful five-member bloc as indicated by his colleagues, and insisted he was his own man.

"I am not a member of any official bloc, faction or federation," he said.

"I will be voting on each bill on its merits and I will be sticking to my principles."

Mr Stonehouse ruled out supporting the McGowan Government's push for methamphetamine traffickers to be jailed for life.

"Filling up our jails and spending valuable police resources attacking what is essentially a non-violent crime — getting high," he said.

"We really should be treating people who are addicts who have a serious illness as patients, rather than criminals."

Premier Mark McGowan has dismissed many of the Liberal Democrat policies, and rejected the notion WA was a nanny state.

"You need to have appropriate restrictions on dangerous conduct by people, we need to protect children," Mr McGowan said.

But Mr Stonehouse said the Government would be arrogant to ignore his arguments, as it needed to work with the crossbench to secure support for its agenda.

"My door is always open," Mr Stonehouse said.