Although the contents of tar in overripe leaves were remarkably low, the release amount of polynuclear aromatic hydrocarbon was as much as that in mellow leaves.

• 过熟烤烟烟叶的焦油含量虽然较低，但烟气的稠环芳烃类化合物总量与适熟烤烟差异并不明显，其中苯并[a]芘含量有明显升高的趋势。