Filters of conventional design consist of a small paper tube which is filled with
activated carbon and is closed at both ends by
cellulose fibres and / or
ceramic caps. Filters consisting only of
cellulose also exist. The filters are used to rotate them with cigarette paper to form a cigarette or a joint. In normal use, one of the filter ends can be singed or burned when the cigarette or the joint is smoked to the end. In addition, specifically in the case of
cannabis, oils emerging as a result of heat can clog the
cellulose, but in particular also the small air passages of
ceramic caps. The invention is intended, by means of the
thermal insulation, to prevent scorching and clogging of the filter elements. The filter elements consist of cellulose and carbon or consist of
ceramic cap / carbon or only cellulose and are to be placed centrally in a small tube consisting of paper. The cavities between the filter elements and the end of the tube are to be filled with specially shaped inserts made of paper or ceramic. The extension of the filter on both sides by the small paper tube is intended to ensure
thermal insulation and to prevent the embers from being in direct contact with the cellulose filter or with the ceramic cap. As a result of the enlarged area, the specially shaped inserts made of paper or ceramic are intended to prevent clogging by emerging oils. In addition, the inserts prevent tobacco or
cannabis particles from being able to fall unhindered into the paper tube.