there is much public misunderstanding about nicotine (less than 10% of adults understand that most of the harms to health from smoking are not caused by nicotine)
Studies by Quik and others involving rats, mice and nonhuman primates have since found similar effects. In short, by driving dopamine, nicotine appeared to ease the tremors and tics caused by Parkinson’s, and even the movement disorder induced by the major Parkinson’s drug.
https://www.gov.uk/government/news/phe-publishes-independent-expert-e-cigarettes-evidence-review
https://www.rsph.org.uk/about-us/news/nicotine--no-more-harmful-to-health-than-caffeine-.html
https://www.discovermagazine.com/health/nicotine-the-wonder-drug
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8078469/
Want me to go on?
Nicotine isn’t the harmful drug the anti-tobacco groups have you believing.