They weren't classified as heavy users...<quoted text>
And yet you stated so confidently that the pot smokers in the study who were able to quit must not have been addicted since they were able to quit.
Looks like that logic failed.
Go back and re-read your own article and try to understand what was being said.
I'm beginning to know now why you don't understand lots of things...you can't comprehend what you are reading.