Joint is a slang term for a cigarette rolled using cannabis. Rolling papers are the most common rolling medium among industrialized countries; however, brown paper, cigarettes with the tobacco removed, and newspaper are commonly used in some developing countries. Modern papers are now made from a wide variety of materials including rice, hemp, and flax.

A joint can range in size, typically containing between 0.25 to 1 grams net weight of cannabis (depending on whether tobacco is used in the rolling process).

Joints consist of dried cannabis rolled inside a cylinder by hand or by a rolling machine. When smoked to the very bottom of the joint, it is often difficult to hold and is called a roach. The roach will often have an appreciable amount of THC from the accumulated resin. The roach can be held with finger nails, roach clips, roach pins, tweezers, or can be smoked using a pipe. Joints are often passed around a group circularly in a clockwise manner, and hoarding the joint (otherwise known as "bogarting") is considered a serious breach of marijuana smokers' social protocol.

A joint is the location at which two or more bones make contact. They are constructed to allow movement (except for skull bones) and provide mechanical support, and are classified structurally and functionally.

Joints are mainly classified structurally and functionally. Structural classification is determined by how the bones connect to each other, while functional classification is determined by the degree of movement between the articulating bones. In practice, there is significant overlap between the two types of classifications.

Terms ending in the suffix -sis are singular and refer to just one joint, while -ses is the suffix for pluralization.

Structural classification names and divides joints according to how the bones are connected to each other. There are three structural classifications of joints:

Joints can also be classified functionally, by the degree of mobility they allow:

Joints can also be classified based on their anatomy or on their biomechanical properties. According to the anatomic classification, joints are subdivided into simple and compound, depending on the number of bones involved, and into complex and combination joints:

Cannabis (/ˈkænəbɪs/; Cán-na-bis) is a genus of flowering plants that includes three putative varieties, Cannabis sativa,Cannabis indica, and Cannabis ruderalis. These three taxa are indigenous to Central Asia, and South Asia.Cannabis has long been used for fibre (hemp), for seed and seed oils, for medicinal purposes, and as a recreational drug. Industrial hemp products are made from Cannabis plants selected to produce an abundance of fiber. To satisfy the UN Narcotics Convention, some hemp varieties have been developed which contain minimal levels of THC (Δ⁹- tetrahydrocannabinol), one of the psychoactive molecules that produces the "high" associated with marijuana. The psychoactive product consists of dried flowers of plants selectively bred to produce high levels of THC and other psychoactive chemicals. Various extracts including hashish and hash oil are also produced from the plant.

The word cannabis is from Greek κάνναβις (kánnabis) (see Latin cannabis), which was originally Scythian or Thracian. It is related to the Persian kanab, the English canvas and possibly even to the English hemp (Old English hænep). In modern Hebrew, קַנַּבּוֹס qannabōs modern pronunciation: [kanaˈbos] is used but מַעֲלֶה עָשָׁן maʿăleh ʿāšān modern pronunciation: [ma.aˈle aˈʃan] (smoke bringer) is the ancient term. Old Akkadian qunnabtu, Neo-Assyrian and Neo-Babylonian qunnabu were used to refer to the plant meaning "a way to produce smoke."