My family member had thrombosis for 15 years can you still treat it? he also has some kind outside infection? he also 20 years smoker?

Need more info: Being a smoker does increase your risk of thrombosis of all types, and there are good treatments for thrombosis when it does occur - but the treatments depend very much on where the thrombosis occurs.

Depends: This type of patient can br difficult but most of the time they can be treated. This patient will want to see a very experienced physician.