I quit smoking a week ago & just read an article that said cigarettes have arsenic in them, is this true?

I have read other articles that talk about the different ingredients in cigarettes that if used alone would kill you. Has anyone else ever heard this?? Is it really true? I'm so happy i quit. After 15 years of smoking off & on, i'm finally done after reading that! I'd really like to keep breathing a while! Anyways..........The Arsenic question anyone know if thats true??