chemicals that are found in cigarettes Tobacco Products and Your Health The Chemistry of Vaping -

[353] The former Miami probation officer quoted above told us she does not think drug possession should be a reason for arrest in the first place, in part because it targets low-income defendants and those with drug dependence who are struggling already

(Subscription, Wikipedia Library access or UK public library membership required.) Pimlott, Ben (1992)

But does the stripped-down, ugly packaging really reduce smoking

If any or all of these things ever concern you, a respirator mask is a good thing to have on hand

Given that smoking kills so many people who do it, the smokers who survive long enough to be at risk of Parkinsons disease might be an unusually hardy bunch, so it could be this rather than the nicotine thats protective against Parkinsons