You can and will die if you quit cold turkey from certain drugs. That is the difference.
Basically with hard chemical dependence there will be some kind of adverse body reaction. With marijuana that doesn't exist or is so vanishingly small that you don't feel anything.
I believe it is rather established that cannabis has withdrawal symptoms in the form of sleep and mood impairments. That would qualify cannabis as physiologically addictive, as indeed would be any drug with physical withdrawal symptoms.
Granted, they may be lesser than other drugs, but they are still there.
What? For many, many users this is just completely not true. Insomnia, headaches, nausea, irritability are all common symptoms of weed withdrawal.