Smoke generator is one of the main components of smoke furnace. The smoking material used is daily wood, which produces smoke under incomplete combustion. The concentration, temperature and humidity of smoke will affect the smoking effect. But smoke contains some carcinogens, such as phenols and organic acids.

1. Smoke contains phenols, alcohols, organic acids, carbonyl compounds and hydrocarbons (benzopyrene in hydrocarbons has strong carcinogenic effect). 

2. Smoke concentration, temperature, humidity and flow rate all affect the smoking effect. Low humidity can quickly form a "dry film" on the surface of meat products, which is not conducive to the penetration of smoked ingredients.