Lack of memory

My father has been a chain smoker now for the past so many years. But recently I have observed he is become very lethargic, lost interest in everything and also forgets things. Though he has reduced his smoking but not completely. Can the above mentioned symptoms be results of smoking? Kindly advice.
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Doctor Answers (1) on Lack of memory

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Dr. Hithysh BM Bangalore | General Physician
hello der your father is suffering from vascular dementia
smoking is the main cause
Problems with short-term memory
Wandering or getting lost in familiar surroundings
Laughing or crying at inappropriate times
Trouble concentrating, planning, or following through on activities
Trouble managing money
Inability to follow instructions
Loss of bladder or bowel control
Hallucinations or delusions
avoid smoking and consult neurologist.
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