When did you first realize that Haram is Haram cause it's harmful?

Well Actually I never made that distinction. To me what's haram is haram because God said so and if he loves you and you love him then you stfu and do as you are told! I guess somewhere in my brain it made sense that it was harmful because I've had my fair share of drunk nights and I know how much they ultimately leave you feeling empty inside so I get it, Its Haram because its bad for you.