Martin A. Lee’s latest book, Smoke Signals: A Social History of Marijuana – Medical Recreational and Scientific reflects his skills as a researcher, especially in the historical sections and his analysis of scientific and medical research. The copy is dense and packed with detail, frequently footnoted for those readers who may be skeptical of his scientific claims. If most Americans would take the time to read this book, it would certainly put the topic of legalizing marijuana in some helpful historical context, and it might help convince those who oppose marijuana legalization that they should reconsider their opposition.