People doing drug injection

I was having drinks with a friend at one of the pub. Then, this group of hooligan looking people came in. We ignored them as they’re settling in at the next table. After like awhile, out of a sudden, one of the men there ruggedly pulled one of hs friend and walked thru between me and my friend to go into another further in area in the pub. My friend was being pushed aside. Ok..fine, we carried on with our conversation...maybe they're drunk..Later when I’m on my way to the toilet and passed by this small room inside, I saw just now that 2 guys were actually drug-addict and were doing drugs there and then.. My god..first time in my life I saw such things…before I can do anything, the alarm clock sounded..I’m actually dreaming..