Rode on the subway the first time last year. My wife has a super sensitive nose so her experience was a little different. But for the average person, I seriously doubt the subway is even that big of a deal like you said. It smelled my the mechanic shop my dad worked at. Grease and metal. And maybe we didn’t hit a rush hour, but it wasn’t all that crowded either. I was a bit bummed no one was break dancing. Stupid youtube always lying to me.
You can, it’s just not as simple as click on circle shape maker. You have to make a circle with the circle selection tool than turn it into a path. It’s only difficult when you’re first figuring it out. Once you do, it’s not a big deal.