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1.
someone who is initially found attractive but upon closer inspection, either by seeing them with a cigarette or by smelling cigaresidue, you realize that he / she is a smoker.

this person can also be known as "a nice piece of ash."
Jeremy: Yowza! Have you seen that new dame on campus? I need to ask her our for a snowcone sometime!

John: Don't waste your time broseph, I saw her smoking under the bleachers the other day. She's just another nicotease.
by JohnnyHollywood April 22, 2009
 
2.
When someone smokes a cigarette by you, but you don't have any.
I was just standing over there by that guy smoking a cigarette, but I don't have any. Such a nicotease, man.
by sarijuanika July 26, 2011