I've actually had certain cards appear with a person (past position in this case) who, when I looked at those cards and asked them if they'd had a problem, admitted to me that they'd been a serious drug addict. The cards I got were (not necessarily in this order):
The Moon
7 Cups
The Devil
Cup cards are red flags: 3 Cups, to my way of thinking, would be that weekend drinker, pot smoker or ecstasy taker--they keep their addiction to partying and weekends...for now. 4/Cups is someone drinking or doing drugs out of boredom. 8/Cups could be someone going sober, entering AA. I don't know about the 9/Cups as I tend to associate that with just a family/friends gathering, but possibly someone who spends too much time in bars and pubs.
7 Cups most certainly. That's someone who is "trapped in their cups," who doesn't want to sober up and come back to reality. Whether that sobering means coming off drink or drugs.
The Moon and the Devil cards are important here because they tell you that the cup card should be read as a drug problem, not as anything else. The Devil tells you that the person is chained to it, and the Moon, at least to me, would hint that it's serious enough to have affected their perception of reality. They're following the Moon--going after the dream world of drugs, and ignoring reality.
Swords can enter into this is the drug problem came from sickness or injury. A person might take a drug for pain management and become hooked on it. 4/Swords would be someone who does need the pain pills, but is taking them to excess, with 9/Swords as an addiction to anything that helps them relax and either sleep or avoid anxiety. 8/Swords could stand in place for the Devil, but you really need one or the other, and the Devil (IMHO) is much more decisive on the question of addiction. 8/Swords is more indicative of that problem, "Do I stop taking the pills and live in pain, or do I take them and remain drugged?"