Tobacco extract, preparation method and application thereof and tobacco product

The invention belongs to the technical field of preparation of tobacco flavors and fragrances, and particularly relates to a tobacco extract, a preparation method and application thereof and a tobacco product. The preparation method of the tobacco extract comprises the following steps that (1), tobacco leaves are smashed and then subjected to subcritical extraction, an extracting agent is removed, tobacco extractum is obtained, and the extracting agent is butane or dimethyl ether; (2) alcohol precipitation and solid-liquid separation are carried out on the tobacco extractum obtained in the step (1), and the obtained clear liquid is concentrated to obtain a tobacco concentrate; and (3) the tobacco concentrate obtained in the step (2) is subjected to first-stage molecular distillation, heavy components obtained through the first-stage molecular distillation are subjected to second-stage molecular distillation, the obtained light components are the tobacco extract, the first-stage molecular distillation temperat