Verbseoul.
하다 verb
흡연하다heupyeonhadato smoke (cigarettes, tobacco)

To say to smoke (cigarettes, tobacco) politely in the present tense, use 흡연해요 (heu-byuhn-hae-yoh). Below is the full conjugation of 흡연하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
흡연해
heu-byuhn-hae
흡연해요
heu-byuhn-hae-yoh
흡연합니다
heu-byuhn-hahm-nee-dah
Past
흡연했어
heu-byuhn-hae-ssuh
흡연했어요
heu-byuhn-hae-ssuh-yoh
흡연했습니다
heu-byuhn-hae-sseum-nee-dah
Future
흡연할 거야
heu-byuhn-hahl- -guh-yah
흡연할 거예요
heu-byuhn-hahl- -guh-yae-yoh
흡연할 겁니다
heu-byuhn-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
흡연하세요
heu-byuhn-hah-sae-yoh
Suggestion / Let's Polite (요)
흡연해요
heu-byuhn-hae-yoh
Question Polite (요)
흡연해요?
heu-byuhn-hae-yoh-?
Connective “and” — (고)
흡연하고
heu-byuhn-hah-goh
Conditional “if” — (면)
흡연하면
heu-byuhn-hah-myuhn
Noun form — (기)
흡연함
heu-byuhn-hahm