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Most Peterson pipe models are available with either a standard, traditional stem (called a "fishtail") or the famous Peterson "p-lip", which directs the smoke toward the roof of your mouth to reduce the chance of burning your tongue

Many of these come in pouches and packages that look like snus or other smokeless tobacco, but they are white and do not contain any tobacco in them

Carcinogenicity and DNA adduct formation of 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone and enantiomers of its metabolite 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanol in F-344 rats

However, an important source of human exposure to this compound comes from cigarettes, which are estimated to account for up to 50% of exposure in the USA