制墨的烟炱，无论松烟、油烟、漆烟，都是用窑烧成的。在窑中间的烟炱，叫“项烟”，属中品。
一项研究表明，每天哪怕只抽10支烟也会损害生育能力。
One study showed that even as few as ten cigarettes a day can damage fertility.
根据杨百翰大学发表的一项研究，比起肥胖或一天抽15支烟，社交孤立对健康造成的风险更大。
Social isolation poses more health risks than obesity or smoking 15 cigarettes a day, according to research published by Brigham Young University.
他做过一项实验：让那些烟瘾很大的人去看一部美化吸烟的电影，看他们是否可以不点上烟。
In one experiment, he measured whether heavy smokers could watch a film that romanticizes the habit without taking a puff.
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