As with most things, moderation is proper when it comes to the use of incense. It would seem, as you describe, too much incense is being burned at one time. And while certain factors such as the size of the church, the height of the ceiling and the ventilation may affect how much can be used, the goal in the modern use of incense is not to overwhelm, or make it difficult to see. 
 
Your pastor's reference to history may indicate that he has something of the Old Testament concept in mind. When the High Priest went into the Holy of Holies of the ancient Temple, ample amounts of incense were used, lest he catch sight of God, and be struck dead. 
 
But given Jesus' ministry to us of sanctifying grace, this sort of concern is not a preoccupation today. Indeed, we are instructed in the liturgy to "Behold the Lamb of God". So, the use of incense to create a kind of impenetrable cloud, is something of a misapplication of an Old Testament concept, and also an excess to be avoided. 
 
However, also to be avoided is the complete rejection of the use of incense in the liturgy which is increasingly demanded by some in parishes. 
 
The use of incense is permitted, even encouraged by the Church for feasts of greater solemnity. It is a beautiful image of prayer and worship ascending to God, as Psalm 141:2 says, Let my prayer rise like incense, the lifting of my hands as an evening offering. And so, incense symbolizes our prayers and praises going up to God, and its fragrant aroma is a sign of his blessings descending gently upon us. 
 
Incense is not to be equated with cigarette smoke, it is not a known carcinogen, it is not a pollutant when used moderately. In fact, incense, like holy water, is often blessed by the priest, and therefore brings blessings. 
 
That said, there are some who suffer from various forms of respiratory distress who may suffer with excessive incense, at least physically. One compromise in these sorts of situations, is to follow the older norms of the Traditional Latin Mass. According to those norms, incense was not carried in the aisle, or the opening and closing processions, but was only imposed and used in the sanctuary area around the altar. As such, at least in larger churches, its effect on the whole congregation can be moderated.

There is no official Church teaching in this regard. Knowledge of DNA etc., is very recent and still deepening. Hence one would not expect a thorough theological treatise on a matter of this sort now. 
 
However, one principle must surely apply, namely the teaching from both Scripture and Tradition that Jesus, as a Divine person, also had a complete, intact human nature and was like us in this regard in all things but sin. Hence, he had the complete and proper number of chromosomes. How exactly God supplied the part usually supplied by a human father is not revealed. 
 
Speculation though, always a human tendency, would remain only speculation. We are dealing with miracle and mystery. But this truth remains clear, Jesus, though one person, is fully divine, and fully human.