Fasting: Does Smoking Invalidate the Fast?

Practical Laws of Islam as per the teachings of Imam Khamenei

Fasting: Does Smoking Invalidate the Fast?

English:

Question #756:

Please, give your opinion concerning smoking by a person who is fasting.

Answer #756:

By obligatory caution, one has to avoid taking in cigarette smoke and the like while fasting. The same rule is applied to drugs absorbed through nose or put under the tongue.

-Imam Khamenei, Practical Laws of Islam, Importance and Conditions of Fasting