Yes, I agree. Nicotine taken in as medicinal quantities would be beneficial in dementia and Alzimer or many other ailments.

Ayurveda has narrated the medicinal properties and usefulness of Nicotine very widely, however not the nicotine that tobacco has.

Tea also has nicotine but it's different and it has more medicinal benefits than its so called harms. Many people don't know that tomatoes and potatoes also have traces of Nicotine.

https://pmc.ncbi.nlm.nih.gov/articles/PMC10361076 .