It's a comparison problem. It won't kill you like alcohol withdrawals will or make you agitated like nicotine will. So then it must be okay right? These same potheads will quote studies and news articles talking about the benefits or just how risk free it is.
Its very similar to the way a functional alcoholic will justify their drinking. They even use avoidance language. 20 years ago we called it weed, now we call it "cannabis". Oh, you're not addicted to weed you're just using cannabis every hour of every day. I think legalization didn't help, nor hurt, but the re-branding of weed as "cannabis" while biologically correct gave these type of people a get out of jail free card. If you don't believe me, say to yourself "I smoke weed 8 times a day" versus "I use cannabis 8 times a day". One of them makes you sound like a degenerate, one of them makes you sound like you take a medication. That difference is very important in justifying addiction in the mind of an addict.