### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
My sister has MS. I recently spent 1 1/2 months with her after she had a benign tumor removed from her spine in the T3 region. She has been very Independent, not wanting anyone involved in her business. What I found in the time I was there is that her house had not been cleaned for some time and she hadn t thrown away a lot of unnecessary paperwork since the 1990 s when she was determined disabled. While cleaning her house and going thru the paperwork, I found some diagnostic comments from her neurologist for which I can use further understanding. They are: 1) cerebral vascular disease, severe; 2) cerebral ataxia secondary to MS; 3) mild bilateral middle cerebral artery stenosis; and 4) vascular risks include chronic smoking. Based on the fact that she didn t smoke while in the hospital and rehab which was over a month and the fact that she started again as soon as she got home, it isn t realistic to expect her to quit even though I wish she would and encouraged it every chance I got. Can you shed light on the diagnosis comments and what can be expected in the future, especially since she continues to smoke?

### output:

Well Multiple sclerosis (MS) is the dymylienating disorder of the nervous system which can lead to cerebral ataxia as well. Cerebral vascular disease / middle cerebral artery stenosis and other vascular risk are associated with the smoking. Cerebral vascular accident may happen if someone continues to smoke which can lead to irreversible neurological deficit. Counselling and medication are two effective modality for quit smoking.