Was the Prophet's -peace and blessings be upon him- knowledge of what is to happen until the Day of Judgment comprehensive, encompassing every small and large detail, or was it general, or was it limited to tribulations only? And does this knowledge imply that if smoking were forbidden, he would have informed us about it?

The Hadith indicates that the Prophet, peace and blessings be upon him, informed about the tribulations and major events that will occur until the Day of Judgment. This does not mean that he was privy to every detail or ruling for everything that would happen.

If there is no specific religious text prohibiting something, it does not mean it is absolutely permissible, because the indication of the Sacred Law on rulings is not limited to explicit texts. Rather, it includes general principles, analogical reasoning (qiyas), and the concepts of opposition and agreement. An example of this is the prohibition of smoking, for which there is no specific text, yet it is forbidden because the harm it causes falls under the general principles of the Sacred Law.

A Muslim asking scholars about the rulings on new matters is commendable and required. It is a form of seeking understanding in religion and guidance. Indeed, the Companions used to ask the Prophet, peace and blessings be upon him, about matters of their religion. As for the prohibition of asking questions in the verse: "O you who have believed, do not ask about things which, if they are shown to you, will trouble you" (Quran 5:101), it refers to questions that are useless, or those intended for ridicule and extremism, not questions seeking knowledge and guidance.