What causes more deaths, illegal or legal drugs (including tobacco, alcohol, over-the-counter drugs, and prescription drugs)?

I am helping my daughter search for this information for a paper she has to write. To be specific, I am looking for reliable websites on these statistics in the USA. The information also needs to be current (within the last 5 years, if possible.

A pie chart, graph, or table with numbers or percentages would be great. Thanks!