For the current German government coalition the legalisation of cannabis is a done deal. Over the course of the legislative period, the possibility is to be created of providing adults with a controlled supply of cannabis for recreational purposes. But regardless of that, the health consequences of cannabis use remain controversial. In his book, the author debates the state of opinion. What findings on cannabis are definite today, and which questions remain unanswered? He also takes stock of the use of cannabis for medicinal purposes, which has been legal for years. Whether about the plant, its effects on body and mind or the legal situation in other countries, anyone who wishes to have a well-considered say on the topic of cannabis needs to read this book.