"Zins" appears to be a misspelling or phonetic confusion for "Zyn," which is a popular product consisting of nicotine pouches. Here is what Zyn are:

• Zyn pouches are small, white nicotine pouches designed to be placed discreetly between the upper lip and gum.
• Unlike traditional smokeless tobacco products like snus, Zyn pouches do not contain tobacco leaves but rather a nicotine powder alongside plant fibers, flavorings, and sweeteners.
• The nicotine in Zyn is absorbed through the mouth's lining into the bloodstream, offering users a nicotine buzz without smoking or chewing tobacco.
• They come in various nicotine strengths (such as 3 mg or 6 mg per pouch) and flavors like mint, coffee, or citrus.
• Zyn is marketed as a smoke-free and tobacco-free alternative to cigarettes and traditional chewing tobacco but is not risk-free because nicotine is highly addictive and may cause health issues such as cardiovascular problems and gum damage.
• The product has grown rapidly in popularity, especially in the U.S., with sales surging in recent years. It is often described as a discreet and convenient way to consume nicotine without the smoke or spit associated with other tobacco products.
• Despite being marketed as safer than smoking cigarettes, Zyn and other nicotine pouches can still pose health risks and have raised concerns about youth usage due to their flavors and ease of concealment.

In summary, Zyn are nicotine pouches used to deliver nicotine orally without tobacco leaves, offering a smokeless nicotine experience that is addictive and not completely without health risks. They are a modern alternative to traditional chewing tobacco or snus but are designed to appeal to users seeking smoke-free nicotine intake. If you meant something else by "zins," please clarify! Otherwise, this is the closest and most relevant explanation based on available information.