An oral product, comprising a body that is wholly receivable in an oral cavity, the body comprising: a porous mouth-stable polymer matrix; cellulosic fibers embedded in the porous mouth-stable polymer matrix; and nicotine or derivative thereof dispersed in the mouth-stable polymer matrix such that the nicotine or derivative thereof is released from the body when the body is received within the oral cavity and exposed to saliva, wherein the cellulosic fibers provide passages in the mouth-stable polymer matrix and the pores contain (an) additive(s); or comprising a body that is wholly receivable in an oral cavity, the body comprising: a porous mouth-stable polymer matrix; cellulosic fibers embedded in the porous mouth-stable polymer matrix; and an additive dispersed in the mouth-stable polymer matrix such that the additive is released from the body when the body is received within the oral cavity and exposed to saliva, wherein the cellulosic fibers provide passages in the mouth-stable polymer matrix and the pores contain (an) additive(s); or comprising a body that is wholly receivable in an oral cavity, the body comprising: a porous mouth-stable polymer matrix; exhausted tobacco fibers embedded in the porous mouth-stable polymer matrix; and an additive dispersed in the mouth-stable polymer matrix such that the additive is released from the body when the body is received within the oral cavity and exposed to saliva, wherein the exhausted tobacco fibers provide passages in the mouth-stable polymer matrix and the pores contain (an) additive(s); wherein in - above, the mouth-stable polymer matrix includes a polymer selected from the group consisting of polyurethanes, silicone polymers, polyesters, polyacrylates, polyethylenes, polypropylenes, polyetheramides, polystyrenes, polyvinyl alcohols, polyvinyl acetates, polyvinyl chlorides, polybutyl acetates, butyl rubbers, and mixtures, combinations and copolymers thereof, and wherein the mouth-stable polymer matrix does not appreciably dissolve or disintegrate when exposed to saliva at about 37°C (about 98.6°F) over a period of one hour; and wherein cellulosic fibers include cellulose or treated cellulose material. comprising a body that is wholly receivable in an oral cavity, the body comprising: a porous mouth-stable polymer matrix; cellulosic fibers embedded in the porous mouth-stable polymer matrix; and nicotine or derivative thereof dispersed in the mouth-stable polymer matrix such that the nicotine or derivative thereof is released from the body when the body is received within the oral cavity and exposed to saliva, wherein the cellulosic fibers provide passages in the mouth-stable polymer matrix and the pores contain (an) additive(s); or a porous mouth-stable polymer matrix; cellulosic fibers embedded in the porous mouth-stable polymer matrix; and nicotine or derivative thereof dispersed in the mouth-stable polymer matrix such that the nicotine or derivative thereof is released from the body when the body is received within the oral cavity and exposed to saliva, wherein the cellulosic fibers provide passages in the mouth-stable polymer matrix and the pores contain (an) additive(s); or comprising a body that is wholly receivable in an oral cavity, the body comprising: a porous mouth-stable polymer matrix; cellulosic fibers embedded in the porous mouth-stable polymer matrix; and an additive dispersed in the mouth-stable polymer matrix such that the additive is released from the body when the body is received within the oral cavity and exposed to saliva, wherein the cellulosic fibers provide passages in the mouth-stable polymer matrix and the pores contain (an) additive(s); or a porous mouth-stable polymer matrix; cellulosic fibers embedded in the porous mouth-stable polymer matrix; and an additive dispersed in the mouth-stable polymer matrix such that the additive is released from the body when the body is received within the oral cavity and exposed to saliva, wherein the cellulosic fibers provide passages in the mouth-stable polymer matrix and the pores contain (an) additive(s); or comprising a body that is wholly receivable in an oral cavity, the body comprising: a porous mouth-stable polymer matrix; exhausted tobacco fibers embedded in the porous mouth-stable polymer matrix; and an additive dispersed in the mouth-stable polymer matrix such that the additive is released from the body when the body is received within the oral cavity and exposed to saliva, wherein the exhausted tobacco fibers provide passages in the mouth-stable polymer matrix and the pores contain (an) additive(s); a porous mouth-stable polymer matrix; exhausted tobacco fibers embedded in the porous mouth-stable polymer matrix; and an additive dispersed in the mouth-stable polymer matrix such that the additive is released from the body when the body is received within the oral cavity and exposed to saliva, wherein the exhausted tobacco fibers provide passages in the mouth-stable polymer matrix and the pores contain (an) additive(s);