If there is even a small concern, then in most cases there is a problem, that given time will only develop and become a bigger problem.
There could be many hidden addictions and there’s rarely no smoke without fire, no matter what story the person you’re concerned about concocts to baffle and confuse you.
If your gut tells you there’s a problem, it’s very likely to be true, since the Addict is the Master at deception and covering up their illness.