The retrospective study on 160 workers exposed to tobaccodust showed that 37.5% of diseases of respiratory system headed the list of the causes of death.
Foreign material remover on each sucking pipe makes final guarantee for quality of cigarettes. Vibratory sieve and dust collection system provides the possibility of re-use of tobaccodust.
External factors: life region climate, dry, cold working environment air is dust, chemical gas pollution, alcohol and tobacco, spicy food stimulation, are easy to long-term chronic pharyngitis.