Some christians smoke crack. Doesn't mean it's a good decision or has anything to do with Christ.
Opium/heroin/morphine/Vicodin whatever is prescribed for medical reasons, and used to be the only relief for wounded soldiers undergoing amputation and whatnot.
Obviously using opium recreationally isn't Dal rehit or anything.
What's your intention for the post? You think opium use is a widespread advocated practice within the Dals?
Or you may, or may not, have seen a pic of a single Nihang or two doing something stupid against rehit, and thought you'd come here and slam them and the entire Nihang image?
I feel sorry for anyone dabbling with or hooked on that stuff. Unfortunately you can guarantee that somewhere a Sikh, Buddhist, Christian, Jew, Muslim, Hindu, Jain, world leader, teacher, Dr, rehab counselor, whoever is using it.
None of these groups advocate it, except maybe the medical profession.
Maybe you can track them down through the pic and offer to help them with rehab?