Perhaps. Personally if I drew the graph, I would put MDMA and cannabis closer together in terms of physical harm. I think they are dangerous in different ways and it's difficult to say which is more dangerous in absolute terms.
Like you say, if you are careful and informed, you can avoid lots of the dangers of MDMA with responsible use. It's difficult to smoke pot and not do some damage to your lungs, no matter how careful you are. Vaporizers not withstanding, but vaping was probably not considered in the graph.
Like you say, if you are careful and informed, you can avoid lots of the dangers of MDMA with responsible use. It's difficult to smoke pot and not do some damage to your lungs, no matter how careful you are. Vaporizers not withstanding, but vaping was probably not considered in the graph.