It is.
Every so often the War-On-Drugs types have to re-justify their own existence.... and it doesn't matter to them what crap study they use to get folks worried again.
Next we'll hear that smoking pot makes your left arm fall off. The fact that nobody actually knows any real person whose left arm fell off due to pot smoking will be ignored....
It is difficult to see how smoking tobacco harms your lungs and smoking pot does not.