You might be right.
Dependence is defined (the way that its typically used in describing drug use) as a 'compulsive or chronic need', or along those lines.
Quote:
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Both animal and human studies show physical and psychological withdrawal symptoms from marijuana, including irritability, restlessness, insomnia, nausea and intense dreams.
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That doesn't quite fit the description. You can guess that the symptoms they describe weren't severe (otherwise they would have said 'severe/serious' to push the point).