Many years ago children learned to read from small books called "primers" and, over time, primers became any book providing elemental information. Mary's Cannabis Primers continue the tradition, providing easy-to-read information on the use of cannabis in treating numerous ailments. This Collection contains the first four volumes in this series and covers basic cannabis science, the endocannabinoid system, cannabis and cancer, and cannabis and nutrition. First published in 2015, the Primers have been in constant demand with thousands of copies in print and one issue translated into Spanish. Mary's Cannabis Primers Collection: Vol I contains the first four issues in this valuable educational series.