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I think Smoot-Hawley had a very minor impact during the Great Depression. The Fed's action, or inaction, caused a 30% reduction in the money supply during the three years following the stock market crash. That is becoming the accepted explanation based on the work of Milton Friedman.

Here an article I've posted often before. Fairly long, but it presents the money supply and Fed case very well.

The great depression and its offspring, the New Deal, could both have been avoided if the Federal Reserve had performed the task assigned to it. All the Federal Reserve had to do to avoid the Depression and the subversion of the American constitutional order was to purchase $1 billion in government securities during the 10-month period from December 1929 to October 1930. The result would have been an increase, instead of decrease, in high-powered money, and the banking crisis that began in the autumn of 1930 would not have occurred.

The Fed's "Depression" and the Birth of the New Deal

Rather than increasing the money supply, Fed decisions decreased it severely.