Major tobacco firms argued in a Montreal courtroom today that the law being invoked by Quebec to get $60 billion from them is unconstitutional.

The companies want the Quebec Court of Appeal to strike down the law.

They failed in a similar bid in Superior Court in March 2014.

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The 2009 legislation is aimed at recouping money the province spends on health care related to tobacco.

It states the government does not have to categorically prove a direct link for all patients between their illness and exposure to tobacco products.

The cigarette companies argue that is unfair.

Today's hearing came a few weeks after Big Tobacco was ordered to pay $15 billion to smokers in Quebec in what is believed to be the biggest class-action lawsuit ever seen in Canada.

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The companies are appealing that court ruling.