** Thanks for contacting with your health concern 1.With a positive family history of stroke and smoking addiction with features of slurred speech, headache, left side weakness, all points towards probable diagnosis of SIE [stroke in evolution] which if left untreated may progress from Hemiparesis (weakness) to Hemiplegia (paralysis), so consult a neurologist for relevant examination and blood work with CT- scan to confirm or exclude the same diagnosis. 2. apart from medical examination one has to look out for any associated risk factor, like: . blood pressure, blood sugar. . lipid profile, overweight. 3. The only way to tell as to what is happening, the best is to get a Neurologist opinion along with necessary investigation like C.T or M.R.I. scan, who may also check with - carotid ultrasound. - echocardiogram [for any blood clots]. - EKG & Chest X-ray. 4. Only after exhaustive examination and investigation, treatment will be initiated by starting or adjusting medications that improve blood flow to the brain [antiplatelets/anticoagulants], along with lifestyle modifications like: - maintain ideal body weight - regular exercise, low salt intake - eating fresh fruits & vegetables - reducing undue physical/mental stress. - routine blood investigations and keeping the level within normal limits. - proper and adequate sleep.