Help me learn about substance abuse/addiction?

My teenager is addicted to drugs and the street life. I am a 50 year old Mom who grew up with a strong work ethic, went to college, had kids, working full time now. Never used substances, so I have no frame of reference, I just can’t comprehend the lying and the roller-coaster of his life. Why would someone choose this, when so many other healthy options are available? I can’t get a handle on this…

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