While All Avodas Hashem Is Beautiful, Total Bitachon Is a Completely Different Madrega

On every Korban it says: רֵיחַ נִיחוֹחַ it is an appeasing fragrance to Hashem. Although sometimes it can have the worst smell (Rashi) it is still called רֵיחַ נִיחוֹחַ an appeasing fragrance, because doing Ratzon Hashem makes it good-smelling, despite the way it really smells. Ketores is the one Avoda that truly smells good. This represents the Cohen himself, who does no Hishtadlus and is totally in Hashem's hands. Someone who does Hishtadlus, although he also has Bitachon, is not on the same Madrega.

I only do Hishtadlus and exercise because it's a Mitzva, but if I can't do it then I'm super happy since I'm Patur, and Hashem will make me just as healthy without it

The Malbim (and Chasam Sofer) say that the special Bracha for: בָּרוּךְ הַגֶּבֶר אֲשֶׁר יִבְטַח בַּה' ירמיה יז ז a person with Bitachon is only for someone who does no Hishtadlus. So we see a totally different world for the Cohen. He indeed smells good: כְּפִשְׁוּטוֹ in the literal sense (with the Ketores), and because of this, many Cohanim were rich. (Chazal). Also, a Cohen is a: מְבָרֵךְ one who blesses Klal Yisroel (Birchas Cohanim) and he is called an Ayin Tov (as it says: טוֹב עַיִן הוּא יְבֹרָךְ משלי כב ט the Ayin Tova shall give blessing). Also, Ketores is an Inyan of Bitachon (R' Yosef Zalman Bloch Shlita), and the last letter (קטרת) stands for "Tikva".