To suggest that cannabis is detrimental to the brain even after not smoking for 7 days is what i disagree with. The very fact that smoking creates carbon monoxide and you are ingesting it would be more harmful to you than anything. So if you're comparing this "study" to smoking than perhaps. But smoking anything, ingesting CO is going to be detrimental to your brain, not just your lungs.

"These results suggest that residual diminished brain activation is still observed after discontinuing cannabis use in motor cortical circuits."
This may be true but it does not imply that cells are destroyed or even harmed due to Cannabis, this says nothing about Carbon monoxide though.

"The facts are there, marijuana damages nerve endings, receptors, clogs brain activity, and all this even in a sober future."

Is what i disagree with. To suggest that consistent cannabis use will harm me long after i've quit is what i see as being a load of crap.