I despise pedophiles just as much as you do, but let’s explore that.
Excluding self defense (preventing imminent & immediate serious bodily harm), smoking a pedophile would be murder & make you a murderer. Two wrongs don’t make a right. It’s not for you alone to decide a man’s fate or take his life. Civilization has law & order for good reason. I don’t feel like these are hard concepts or explaining why vigilantism is harmful to society is controversial.
A pedophile should stand trial and be severely punished for their crimes. Everyone, including the worst criminals, deserve and have a right to their day in court. I support the death penalty for sexual abuse of a child.