Preheat your smoker to 225°F using high-quality wood like oak or hickory.
Trim the beef brisket flat of any excess hard fat, leaving about a quarter-inch of the fat cap for moisture.
In a small bowl, whisk together the sea salt, black pepper, garlic powder, and onion powder.
Apply the spice rub generously to all sides of the brisket, pressing it firmly into the meat.
Place the brisket in the smoker and cook until the internal temperature reaches 165°F, which typically takes 4 to 5 hours.
Wrap the brisket tightly in butcher paper or foil and return it to the smoker until the internal temperature reaches 203°F.
Remove the brisket from the heat and let it rest for at least 30 minutes to allow the juices to redistribute.
While the meat rests, heat the olive oil in a large skillet over medium heat and add the shredded cabbage, vinegar, and smoked paprika.
Sauté the cabbage for 5-7 minutes until tender but still slightly crisp.
Slice the brisket against the grain into thin strips and serve alongside the warm cabbage.