The Oregonian's full series:

PART 1: "Dangers shadow the quick, powerful marijuana high" ... Butane hash oil is a hot product on the marijuana market, offering consumers a quick and powerful high. The production of BHO, as it's known, comes with risks. Butane-fueled blasts have sent 17 people to a Portland burn unit with serious injuries in the past 16 months.

PART 2: "New methods to consume marijuana add to its allure" ... BHO can be consumed using discreet portable pen-like devices or specially outfitted pipes called oil rigs. A small bit of hash oil is placed in the pipe's compartment, which is heated with a torch. The hash vaporizes and the consumer inhales through the pipe, a technique called "dabbing."

PART 3: "A single spark can lead to an explosion during production" ... Hash is as old as marijuana cultivation itself and BHO, too, has been around for a few years. But newer production methods that do a better job of stripping hash oil of residual solvent have made the product more popular, say BHO consumers. Home producers often misunderstand the risks associated with using butane. The gas can quickly fill an enclosed space, where something as ordinary as a pilot light can ignite a fireball.

PART 4: "Public safety is focus of states' marijuana regulations" ... While Colorado and Washington have taken steps to regulate BHO production, the process remains unchecked in Oregon.

GLOSSARY: "Definition of terms in the marijuana business" ... Butane hash oil has its own terminology and equipment. Here's a look at the most common terms when it comes to BHO.