MailOnline 19 May 2015
Smoking cannabis just once a week makes a person more likely to suffer respiratory problems, a study has warned.
Users were more likely to suffer symptoms of bronchitis, including coughing in the morning, bringing up phlegm, and wheezing.
But when they cut down on cannabis or quit smoking, most found the symptoms reduced to levels similar to those found in people who do not smoke the drug, researchers found.
However, people who had been heavy users had a persistent cough and wheeze even after they cut down or quit, suggesting heavy cannabis use can have long-term affects on the lungs.
The study’s lead author, Dr Bob Hancox, an associate professor at the University of Otago, said: ‘Even people who only used cannabis once per week were likely to have a cough, bring up phlegm from the chest, and get wheezy.
‘The good news is that if they stop smoking cannabis, these symptoms usually improve, although there was evidence that cough and wheeze may persist in those who have been long-term heavy users.’