Federal Health Minister Nicola Roxon says the Government is determined to fight any legal challenge to its plain packaging laws for cigarettes.

Legislation for the policy will be introduced into Federal Parliament today.

The tobacco industry is warning of several legal challenges to the legislation in a move it says could cost the Government billions of dollars.

But Ms Roxon says the Government is prepared to fight the challenges because the long-term results will be worth it.

"We spend billions and billions of dollars in our health system and elsewhere picking up the pieces from the harm caused already today by tobacco smoking, and we want to make sure we can reduce that into the future," she said.

"If we have to spend some money fighting for that cause in the courts, we'll do so.

"We're determined to take legislation to protect peoples' lives, they're obviously determined to take action to protect their profits, and we're confident that that's a fight that we will win."

Tobacco giant Philip Morris is among the companies taking legal action over the laws.

It is accusing the Government of breaching a bilateral investment treaty with Hong Kong, where the company is based.

Late last month it served a notice of claim on the Government, triggering a three-month negotiating period, and says if there is no resolution the matter will go to international arbitration.

Ms Roxon says the Federal Government's lawyers are assessing the claim.