習慣 しゅうかん せい薬物 やくぶつでしょう
shūkan sei yakubutsudeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 習慣性薬物

1. Probably a habitual drug.; Possibly a drug of habit.

Polite
Presumptive
Conjecture