Saw that come up as a worry around Covid, seems the loss of smell/taste is a commonality with Parkison. We will not know for a decade or two though, but these biomarkers might help accelerate measuring the impact.
This acting out of dreams is a very strong precursor to Parkinson’s. According to this, 80% of people with it get Parkinson’s within 20 years.
https://scholar.google.com/scholar?hl=en&as_sdt=0%2C31&q=nic...
Then I got diagnosed with ADHD, got stimulant meds which restored the energy and then some, and it was clear I had been self medicating all my life with nicotine and I was completely lost without. If one day I lose access to stimulant meds, you better believe I'm back on the patch and/or the vape.
But in general dude, do not joke about nicotine. You are 3 years clean, it's incredibly hard to quit. If you done it once, it doesn't mean you'll do it twice. Maybe avoiding Parkinson's by vaping is a terrible excuse. You've never known addiction if you believe this time you'll be able to control it.