General natural wood flavor will not cause any harm to the human body, but some of the wood, such as incense wood, sandalwood will come with the aroma, some people will come with the aroma of these wood allergies or cause dizziness, nausea and other symptoms, but most people sniffing this wood comes with the aroma will not have any effect. But in addition to the wood comes with the aroma, there are many processed wood on the market, in the wood exterior spray a layer of paint, this paint will come with carcinogenic substances, such as formaldehyde on the human body will cause great harm, it is recommended that we buy new wooden furniture can be placed in the home for a period of time before using, if the paint flavor is too heavy is not recommended to buy.