I seriously doubt that you rely on willow-bark tea when you have a headache. You may not even rely on the "willow-bark-like drug," aspirin anymore -- but instead on "aspirin-like" drugs like ibuprofen.
Just because you may get medical benefit from fouling your lungs with pot smoke, doesn't mean it can't be done better, and far more safely.
Willow bark or aspirin...Percocet works pretty well