The British Lung Foundation carried out a survey of 1,000 adults and found a third wrongly believed cannabis did not harm health.
And 88% incorrectly thought tobacco cigarettes were more harmful than cannabis ones - when the risk of lung cancer is actually 20 times higher.
The BLF said the lack of awareness was "alarming"....
A new report from the BLF says there are established scientific links between smoking cannabis and tuberculosis, acute bronchitis and lung cancer.
There is a sensible debate to be had about whether criminal law is an apt tool to suppress drug use. There is absolutely no sensible debate about whether pot is healthy. It isn't. The only serious question is whether its health effects are bad or extremely bad.