You might want to read the actual paper. It doesn't say what you've "been saying".
The key assumption in the paper is the assumption that the air in the room is well mixed. In other words, they begin by assuming that viral concentration is equal in all parts of the room. This makes the 6 foot versus 60 foot risk conclusion pretty much inevitable.
The section "beyond the well mixed room" is much more interesting. It gives a detailed explanation of what air flow paths exist, and how masks, distance, and being outside each work.
The simple risk is called respiratory jet. This is the direct wind created by your breath and speech. It is also a region of higher virus concentration. The higher viral load extends about 2m if unmasked. If you wear a mask, the air is slowed and respiratory jet doesn't go as far. Instead, it mostly goes up as hot air rises. (Masks and distance out to 2m help with this part of risk.)
The less direct risk is just increasing concentration by being in an enclosed space. If I am sick and spend 3 hours in a room, then I have added 3 hours of exhaled virus to the air. The longer I spend, the higher the viral concentration. And, the longer you spend in that room, the higher your exposure.
Cloth masks and distance beyond 2m do not help with this part of risk. N95 masks or better ventilation do help. Or, just avoid indoor spaces and go outside.
In all, the authors give a really good description of why masks, distance, and being outside are helpful, and the limitations of each.
If someone is smoking near you you probably aren’t indoors. If you are yes there is an issue. It continues to puzzle me why the simple measures to limit potential exposure are so hard for people to grasp . . . like those driving alone masked? Lol!
If you prefer: smelling someone sucking on a lozenge, the garlic they just had for breakfast, their perfume, or their gas (particularly since the latter may actually transmit the virus).