An ashtray's a receptacle for ash and butts from cigarettes and cigars of tobacco and Cannabis (drug). Ashtrays are typically made of glass, pottery, or metal. The most common ashtray design's a shallow cylinder with a flat base, to rest on a table. Many ashtrays have notches at the rim, to hold cigarettes and/or a cigar. In Spain, some ashtrays consist of two interlocking parts, the bottom of which's filled with water. Ashtrays are also built into cars and dustbins, and provided in toilets a… (More on Ashtray)