Stage four throat cancer spread to lymph nodes. smoker and heroin user. inoperable, no treatment at all. life expectancy?

No clear answer: Would seek out a palliative care doctor who could help making whatever time is available more comfortable and meaningful. Sorry that cannot be of more help.

Why no treatment?: Head and neck cancers are different from many other cancers in that you can be diagnosed with stage four cancer and still have a fairly high cure rate without surgery. Chemotherapy and radiation can be curative. Once the lymph nodes of the neck r involved it is often a stage four and many patients are diagnosed at that point and are unresectable. If in lungs no cure. No tx.