How does morphine effect the human body?

well i think that the body is used to morphine now and is addicted and you don't want it to be jfhs ajf Some people have been on small doses of morphine for years and have led a relatively healthy life. However, it is addictive as you know and there comes a time when a little isn't enough. It's hard on the heart, kidneys and liver, not to mention damaging brain cells.