sweetness, while lighter usually have a "drier", more neutral taste. Evaluating the flavor of cigars is in some respects similar to wine-tasting. Journals are available for recording personal ratings, description of flavors observed, sizes, brands, etc. Some words used to describe cigar flavor and texture include; spicy, peppery (red or black), sweet, harsh, burnt, green, earthy, woody, cocoa, chestnut, roasted, aged, nutty, creamy, cedar, oak, chewy, fruity, and leathery. Smoke Smoke is produced by incomplete combustion of tobacco during which at least three kinds of chemical reactions occur: pyrolysis breaks down organic molecules into simpler ones, pyrosynthesis recombines these newly formed fragments into chemicals not originally present, and distillation moves compounds such as nicotine from the tobacco into the smoke. For every gram of tobacco smoked, a cigar emits about 120–140 mg of carbon dioxide, 40–60 mg of carbon monoxide, 3–4 mg of isoprene, 1 mg each of hydrogen cyanide and acetaldehyde, and smaller quantities of a large spectrum of volatile N-nitrosamines and volatile organic compounds, with the detailed composition unknown. The most odorous chemicals in cigar smoke are pyridines. Along with pyrazines, they are also the most odorous chemicals in cigar smokers' breath. These substances are noticeable even at extremely low concentrations of a few parts per billion. During smoking, it is not known whether these chemicals are generated by splitting the chemical bonds of nicotine or by Maillard reaction between amino acids and sugars in the tobacco. Cigar smoke is more alkaline than cigarette smoke, and is absorbed more readily by the mucous membrane of the mouth, making it easier for the smoker to absorb nicotine without having to inhale. A single premium cigar may contain as much nicotine as a pack of cigarettes. Parasites Cigars, alongside other tobacco products, can be infested by parasites such as the Lasioderma serricorne (tobacco beetle) and the Ephestia elutella (tobacco moth), which are the most widespread and damaging parasites to the tobacco industry. Infestation can range from the tobacco cultivated in the fields to the leaves used for manufacturing cigars, cigarillos, cigarettes, etc. Both the larvae of Lasioderma serricorne and caterpillars of Ephestia elutella are considered a pest. Humidors The level of humidity in which cigars are kept has a significant effect on their taste and evenness of burn. It is believed that a cigar's flavor best evolves when stored at a relative humidity similar to where the tobacco is grown,