they cause effects in both pests and humans
1 2 3 "Federal appeals court upholds $2.8M award for faulty smoke alarm"
A total of nine compounds (butyl acetate, p-xylene, dimethoxycyclohexane, benzyl alcohol, 1,2-diacetin, nicotine, adipic acid, phthalic acid, and dioctyl terephthalate) were detected in methanol extract of cigarette butts, while 14 compounds (diacetone alcohol, m-xylene, debrisoquine, ageratriol, triacetin, nicotine, neophytadiene, palmitic acid, tributyl acetylcitrate, adipic acid, phthalic acid, dioctyl terephthalate, vitamin E, and betulin) were detected in acetone extract of cigarette butts
If you want to plan ahead, find a list of restrictions at the Japan Customs website