There's so much great information here for marijuana smokers and growers, and medicinal users, it's hard to be brief. Clarke explains why highs are different, devices that produce healthier smoking techniques, when to harvest for potency, etc. Hashish making is fully explained worldwide, and then he improves on those techniques, even showing how you can make it at home, very simply. Loads of beautiful color photos. It's also surprizing and fun to read with great cartoons that dispel a lot of marijuana myths. It's easily the best book on marijuana/hashish since Frank and Rosenthal's Grower's Guide Deluxe.