While you are on Warfarin - and this would be life-long for you - you are at risk from both under-dosing, which would lead to embolism, and over-dosing, when you could have bleeding from some part of your body, including the brain.
Warfarin reduces the serum levels of Vitamin K-dependent clotting
factors synthesized in the liver - this is its primary and desired effect. Alcohol also has effects on the liver, and smoking increases the chances of thrombosis and embolism.