Although Cigarette Smoking Poses Its Own Negative Effects on Health

Although cigarette smoking poses its own negative effects on health, how has it been shown to reduce one's risk of developing Parkinson's disease?

A) It may prevent the accumulation of enzymes.
B) It may prevent the accumulation of proteins.
C) It may prevent the accumulation of neurotransmitters.
D) It may prevent the accumulation of neurotoxins.