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But Jonathan Liberman, senior legal policy adviser to the International Union Against Cancer, told ABC radio: "We're really confident Australia wouldn't be in breach of any international legal obligations." He added, in a reference to the WHO's Framework Convention on Tobacco Control: "On the contrary, we would see this as Australia showing international leadership in implementing obligations under international law." Australia has long been at the forefront of the war on tobacco

The stigma of cannabis is fading, but that doesnt mean all uncertainty is eliminated when it comes to smoking the plant

For example, Hohl et al

After 10 years: Within 5-10 years, risk of having a stroke drops to the same as that of a non-smoker, Risk of developing cancers of the lungs, mouth, throat, esophagus, bladder, kidney and pancreas continues to drop

Carbon monoxide - highly injurious to the blood vessel wall