Peace be upon you. It is recommended that a fasting person avoid smoking all types of tobacco and inhaled substances. According to Grand Ayatollah Khamenei, it is obligatory to refrain from smoking during fasting. If a person smokes for any reason, they must continue to fast for the rest of the day with the intention of fulfilling their obligation and then make up for the fast later. Grand Ayatollah Sistani also advises that smoking is considered to break the fast, and smokers should control themselves and refrain from smoking during Ramadan. If they do smoke, they must continue fasting for the rest of the day and make up for it later. May you be successful in all good deeds.