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I think people need to agree what constitutes “addictive”.
Depends on the stoner. You can consume alcohol without being an alcoholic, you can consume cannabis without being addicted to it as well. 
But there are stoners that can't function without it, and end up getting so high they can't function on it either, and they should realize they have a problem and seek help. >

The difference is someone who casually uses doesn't identify themselves as a stoner. The same way someone who enjoys the occasional drink doesn't identify themselves as an alcoholic.