i have heard long term abuse can cause damage to organs however i don't know specfics I am sure someone will come along with more knowledge.
I have never heard of opiates causing CHF, liver and kidney failure is definitely possible depending on the drug and the amount of drug used. What can cause heart failure is cocaine, and methamphetamine. Also if you are injecting you could introduce bacteria that can attack the valves/ heart muscle. What are your symptoms?
you cannot believe everything you read on the internet , but this is interesting,,,
http://www.articlealley.com/article_471045_23.html
WMN854 is right! Coke and Meth can definitely cause a heart attack and possibly a stroke, but I'm not sure about the stroke.
I took toxic amounts of Vicodin for 14 years straight and my liver and kidney's are perfect, BUT you can't just roll the dice like that. I'm sure, had I continued, my liver would have probably suffered at some point. You have to remember that your liver is the boy's filtering device. If it becomes irreparably damaged, you're dead!
Your mind mind not believe you know, but you will be happy again and actually, you'll be happier than you are now. I'm sure it doesn't seem like it, but it will happen!