Hi, it shortens their life span 10 years (OR) it shortens their life 10 years they ignore all the information (OR) they ignore all of the information You're the one who picked up the cigarette, so you will be the one who is going to throw it away. (anything wrong in this sentence) it shortens their life span by 10 years (OR) it shortens their lives by 10 years You could say either. I'd probably say It takes 10 years off their lives.
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