Snuff

Snuff is a type of smokeless tobacco that is ground up to be ingested either via the nose or the mouth. It is often used for instances where people aren't allowed to smoke.

Peace Sentinel members
Dr. Strangelove, due to her work in AIs, utilized to using snuff to satiate tobacco, as cigar(ette) smoke would ruin the precision equipment.

Militaires Sans Frontieres
Although the MSF leader Big Boss does not use snuff regularly, he once had to ingest it at Strangelove's command before entering the AI Lab to encounter The Boss AI, due to cigars being forbidden inside the AI lab for their smoke contaminating the precision equipment.

The Cipher agent Pacifica Ocean, better known as Paz Ortega Andrade, utilized snuff during her stay at Mother Base, as she had to keep up the appearance of being an innocent schoolgirl for her mission. She specifically used the kind where she placed it directly beneath the gums and wasn't used to it, which gave her a minor quirk where she places her finger on her lip to keep it settled, something Miller and Big Boss later deduced after she was exposed as a spy. When revealing her true loyalties by hijacking Metal Gear ZEKE, she proceeded to admit that she used snuff tobacco and proceeded to spit it out, claiming she hated it.

Appearances

 * Metal Gear Solid: Peace Walker