A spliff is, originally, a Jamaican term for a large cone-shaped smoking device carved of wood and packed full of ganja (possibly mixed with tobacco leaf (fronta) or pieces, as per one's taste). Eventually rolling papers replaced the solid cone. Outside of Jamaica, the word may have diverse meanings.
Spliff is slang for a cigarette rolled with cannabis, often including tobacco. Spliffs come in a variety of shapes and sizes, and are also commonly referred to as joints (in America especially), although joint refers to a cigarette made with cannabis alone (no tobacco). They are sometimes called zoots, doobies, or (often sarcastically) referred to with their old slang name of reefers, especially by people who have seen the classic moral panic film Reefer Madness. While "reefer" and "joint" are almost certainly American terms, "spliff" is a term that originated in Jamaica. In the United Kingdom, the phrase "skinning up" is commonly used to describe the creation of a cannabis or cannabis/tobacco combination cigarette.
While the spliff is popular all over the world, there are differences in the way they are prepared and the sub-cultures surrounding them. In the United Kingdom and in many parts of Europe, the zoot comprises a cannabis/tobacco mix and is made from a king sized paper, and most smokers take particular pride in their rolling abillites, so much so it is often a point of contention.
In the U.S. where flowered marijuana is most common spliffs are generally made without tobacco or crutches/roach and usually with small rolling papers. Where as in many South American countries almost anything at all will be used to wrap uncrumbled buds, with reports ranging from toilet paper to bus tickets.
European variations include the "Spanish Crutch" where a 1/4 inch of a cigarette is used as the roach/crutch, and the "Flaming Backflip" where the paper is folded inside out before rolling, and carefully rolled with the gum being licked then tucked in first to ensure only one layer of paper is used.
Hashish is more common in Europe than in the States, and it is extremely impractical to roll or smoke a hashish joint without another substance ie tobacco, so this too can effect the way it is consumed.
There is a growing contingent of enthusiasts interested in preparing spliffs of different shapes and sizes, from the famed Camberwell carrot to more esoteric constructions that have a degree of engineering to them, such as the Dutch Tulip.
For better descriptions check Dutch Wikipedia http://nl.wikipedia.org/wiki/Joint
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