cigarette hand smoke Smoking & Hands | How

The main advantage of using lags as the instrumental variables is that they are strongly correlated with the current price, therefore avoiding the weak instrument bias problem

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However, this year Chen's habit led to serious consequences at the Xiamen International Marathon: he was given a two-year ban from competing, his race results were annulled, and he may face further disciplinary action from the China Athletic Association (CAA)