Reuters reports about New Zealand Medical researchers' claim that smoking cannabis joints is as bad for the lungs as smoking 5 tobacco cigarettes. The Medical Research Institute of New Zealand tested 339 people divided into 4 groups: cannabis smokers, tobacco smokers, those who smoked both, and non-smokers. "Those who smoked cannabis damaged both the lungs' small fine airways, used for transporting oxygen, and the large airways, which blocked air flow, the researchers said." In other words the lungs stop working normally. This along with a British report about cannabis smokers having an increased risk of developing a psychotic illness such as schizophrenia have British officials considering classifying cannabis as a more dangerous drug.