Acetylcholine is a chemical in the brain which works to regulate the effects of dopamine. It has been known for many years that nicotine imitates many of the actions of acetylcholine. In preliminary studies, nicotine has been shown to reduce impulsive behavior in Attention Deficit Hyperactivity Disorder. By administering nicotine across the skin using a patch, we hope to better understand whether nicotine may act to improve impulse control disorders in PD without needing to reduce or stop PD medications. Several studies have shown that nicotine is tolerated well by people with PD, and does not appear to worsen motor/movement symptoms. The amount of nicotine in each patch used in this study is the same as patches that are used in people who are trying to quit smoking.