It is possible to smell alcohol on someone’s breath the day after they have been drinking, particularly if they have been drinking heavily. The scent of alcohol can linger in the body for up to 24 hours, and the specific smell can be affected by factors such as the person’s diet and hydration levels. It is also worth noting that some alcoholic beverages, such as red wine, can cause a more noticeable and long-lasting odor on the breath. However, the scent of alcohol on someone’s breath does not necessarily indicate that they are currently under the influence of alcohol.