Chewing tobacco is a type of smokeless tobacco made from cured tobacco leaves that you place in your mouth and chew rather than smoke. It delivers nicotine through the lining of your cheeks and gums, and it comes in three distinct forms: loose leaf, plug, and twist. Despite being smoke-free, chewing tobacco carries serious health risks, including a threefold increase in oral cancer risk for regular users compared to non-users.
The Three Forms of Chewing Tobacco
Loose leaf is the most common form sold in the United States. It consists of cut or shredded strips of tobacco leaf, usually sweetened and sold in foil-lined pouches. The texture is tacky, and users pull out a wad to place between their cheek and gum.
Plug tobacco is made from tobacco leaves pressed together and bound with a sweetener like molasses, creating a dense, square block that looks a bit like a brownie. You bite off a piece directly from the plug or slice it into portions before chewing. Twist (sometimes called rope tobacco) is made from strands of tobacco twisted together and cured in that shape, then cut into usable pieces.
All three forms typically contain added sweeteners such as sugar or molasses, along with flavorings like licorice. The sweetening serves a dual purpose: it improves taste and helps bind the tobacco together.
How Nicotine Gets Into Your Body
When you place chewing tobacco against your cheek or gum, nicotine passes through the soft tissue lining of your mouth and into your bloodstream. The speed and strength of this absorption depend heavily on the product’s pH level. Higher-pH (more alkaline) products convert nicotine into its “free-base” form, which your oral tissue absorbs far more efficiently.
The difference is dramatic. In clinical testing, raising the pH of smokeless tobacco from 5.0 to 8.6 produced more than a fourfold increase in peak nicotine blood levels. This is why some manufacturers adjust the alkalinity of their products: it directly controls how much nicotine hits your system and how quickly you feel it. Nicotine concentrations across smokeless tobacco products range from about 4 to 40 milligrams per gram, a tenfold spread that means two products can deliver vastly different doses.
Chewing Tobacco vs. Dip and Snus
People often use “chewing tobacco” as a catch-all for anything you put in your mouth, but the products are different. Chewing tobacco (loose leaf, plug, or twist) is meant to be actively chewed, which releases flavor and nicotine. It produces a lot of saliva mixed with tobacco juice, which most users spit out.
Dip, also called moist snuff, is finely cut tobacco that you pinch and place between your lip and gum. You don’t chew it. Snus is a Swedish-style product, also placed against the gum, but it’s typically pasteurized rather than fermented and often comes in small pre-portioned pouches. Both dip and snus can be loose or pouched. The FDA classifies all of these as smokeless tobacco products, and all deliver nicotine through the mouth’s lining.
Oral Health Effects
The most visible damage from chewing tobacco shows up where the tobacco sits. A grayish-white, wrinkled patch of tissue often develops at the placement site. This is called tobacco pouch keratosis, and it’s the mouth’s reaction to constant chemical irritation. In some cases, the tissue develops a rough, “pumice-like” pattern of raised white lines, particularly on the softer inner surfaces of the cheeks and lips.
These white patches can sometimes progress to leukoplakia, a condition where thickened white lesions form on the oral tissue. Leukoplakia is classified as a potentially malignant disorder, meaning it doesn’t always become cancer but carries that risk. The non-homogeneous types, those with mixed red and white coloring, nodular bumps, or a warty surface, are more concerning than flat, uniform patches.
Gum recession is another hallmark. The gums pull away from the teeth, exposing root surfaces, particularly around the front teeth where users most commonly hold tobacco. This leads to periodontal pocket formation, plaque buildup, and eventually periodontitis, a progressive infection of the tissues supporting the teeth.
Cancer Risk
Chewing tobacco contains tobacco-specific nitrosamines, a class of potent carcinogens that form during the curing and fermentation of tobacco leaves. The cancer risks are well-documented across multiple large studies.
Oral cancer is the strongest association. Frequent users of chewing tobacco or snuff face roughly three times the risk of developing oral cancer compared to non-users. Some studies in specific populations have found even higher numbers. Among nonsmoking women who used snuff, one study found the risk was more than six times higher than non-users, and another found an odds ratio of over 30 in a population where snuff use was the primary tobacco exposure.
Esophageal cancer risk is moderately elevated, with studies showing roughly 1.4 to 3.2 times the risk depending on the population and type of product. In parts of India where dried tobacco leaf chewing is common, women who chewed had six times the esophageal cancer risk of non-chewers. Pancreatic cancer also shows an association, with studies finding 1.7 to 3.6 times the risk among smokeless tobacco users, though the evidence is less consistent than for oral cancer.
Nicotine Dependence and Quitting
Chewing tobacco is addictive. The steady nicotine delivery through oral tissue creates dependence just as cigarettes do, and quitting can be equally difficult. Nicotine replacement therapy (patches, gum, or lozenges) is the most studied cessation tool for smokeless tobacco users, and it does improve quit rates, though success varies widely.
Across clinical trials, nicotine replacement roughly doubled to quadrupled the odds of quitting compared to placebo, depending on the study and the dose used. In one trial, 48% of participants using nicotine replacement were tobacco-free at 12 weeks, compared to 19% on placebo. Higher nicotine replacement doses tend to work better, likely because they do a better job of suppressing withdrawal symptoms in heavy users.
Combining nicotine replacement with behavioral support makes a meaningful difference. Studies that paired nicotine lozenges or patches with coaching calls or interactive web-based programs consistently showed higher abstinence rates than nicotine replacement alone. Confidence in your ability to quit also matters: participants with higher self-efficacy at the start of treatment were more likely to succeed. Interestingly, people with the heaviest nicotine dependence at baseline benefited the most from nicotine replacement, suggesting the therapy is especially useful for the hardest cases.
Regulation in the United States
The FDA regulates chewing tobacco as a tobacco product. Federal law prohibits sales to anyone under 21. Smokeless tobacco products must carry health warning labels, a requirement formalized in 2010. Unlike cigarettes, which saw flavored varieties (other than menthol) banned in 2009, flavored smokeless tobacco has not been subject to a similar ban. The FDA issued an advance notice of proposed rulemaking on flavors in tobacco products in 2018, but no final rule restricting flavors in smokeless products has taken effect.