So your claim is not about the article but about your opinion. Got it.
When the researches were looking at brain scans... the brains of potheads looked similar to brains of people who were older. This is not a good thing
"Not a good thing" does not equate to "damage". What the article actually says is that if I were a pot smoker my brain would be that of a 57-year-old rather than a 54-year-old ... well, big freaking deal - when I'm 57 I'm not going to consider myself "damaged".
That is not what the article is saying. The article is saying that pot decreases the circulation to vital areas of your brain enough that it can be be quantized in an MRI scan. And in fact it has a much larger effect on the brain's blood supply than any other external factor that they could find... nearly five times that of alcohol. Making light of this and ignoring this is irresponsible. Your arguments are juvenile to say the least and with this knowledge pushing for legislation to make marijuana more accessible is irresponsible.