Points to ponder:
probably paper hankies are thinner than they used to be. That way you will use more, as one is not sufficient to blow your nose in properly. And the manufacturer sells more, which is the point of making them of a poorer quality.
We are surrounded by various agents than can cause allergies, and how many of us can honestly say that we dust often enough, wash the kitchen floor daily, or even once a week, and don't have perfumed this that and the other - deoderants, shaving foam, bath soap, shampoo, cleaning agents all smelling different and any one of more of them could be the cause of your needing to blow your noses more often.
I am currently trying to find out why I have three violent bouts of sneezing spaced out during the morning and forenoon, then none for the rest of the day!