The one with helping out

Last night, I got to talk to one of my former colleagues and she mentioned to me that her brother will be admitted again for a drug rehabilitation. I know this topic is a little sensitive but I just wonder why some people, despite of their economic status (whether rich or poor) and family support can still utter to throw their lives away for drugs. What benefits will they get? Will the addiction to it satisfy or even compensate for the number of days shortened in their lives? Will they ever give up drugs once addicted to it? I just hope and pray that those who have been victims of drugs will survive this and will never come back to using it.