In fact the prophet was stern and adviced us. As muslims, as human beings to refrain from doing anything like how animals do. Such as how to go in sujuud during prayers and habits of ANIMALS in eating. example Animals blows, smells food as part of their Animalistic eating habit of which the prophet of Allah advices us against it.
And scientifically proven that in both smelling and blowing on food whiles eating contaminate the food with the pollutant – carbon (Iv) oxide. This is a toxin or poison to us as human beings. Ishaq Aidoo.
The wisdom behind that is that breathing into the vessel is off putting to the one who is going to drink from it after him. Some diseases from the stomach, lungs or mouth may be expelled with the breath and stick to the vessel, or he may choke if he breathes into the vessel. Hence the Prophet (peace and blessings of Allaah be upon him) forbade breathing into vessels; rather one should take three breaths, holding the vessel away from the mouth each time. End quote.
It was narrated from Abu Sa’eed al-Khudri (may Allaah be pleased with him) that the Prophet (peace and blessings of Allaah be upon him) forbade blowing into one’s drink. Narrated by al-Tirmidhi (1887) who said: a saheeh hasan hadeeth. It was also classed as saheeh by Ibn al-Qayyim in I’laam al-Muwaqqi’een (4/317).
Shaykh Ibn ‘Uthaymeen (may Allaah have mercy on him) said in Sharh Riyadh al-Saaliheen (2/457):
That is because if a person blows (into the vessel), some harmful things may come with the air that is exhaled, such as disease and the like. But some of the scholars made an exception in cases of necessity, such as if the drink is hot and he needs to drink it quickly. In that case some scholars granted a concession. But it is better not to blow on it, even if it is hot. If it is hot and he has another vessel, then he may pour some of it into that vessel then pour it back until it cools down. End quote.
Once the reason for the prohibition on blowing or breathing into the vessel was understood, the scholars drew an analogy with everything that may lead to contamination of food and drink.
Al-Shawkaani said in Nayl al-Awtaar (8/221):
Just as one should not breathe into the vessel, one should not burp into it either. End quote.
With regard to the ruling on smelling food or drink, if smelling the food or drink is done in such a way that the breath coming from the nose will come on the food then it is not allowed in this case. But if none of the breath will come on it, rather the person only wants to know what this food smells like so that he can know what it is, then there is nothing wrong with that. But when the mouth is brought too near to food or drink, that is usually accompanied by some of the breath that is exhaled from the nose. Hence some of the fuqaha’ regarded it as makrooh to smell food.
It says in Radd al-Muhtaar, which is a Hanafi book (6/340):
Food should not be eaten when it is hot, and it should not be smelled. End quote.
It says something similar in Mughni al-Muhtaaj (4/412), which is a Shaafa’i book.
But if a person wants to smell the steam coming from food from a distance, because of a need to do so and he is keen to ensure that none of his breath reaches the food or drink, then there is no reservation concerning that, in sha Allaah..