So my only worry is the smell in flower
If you're in a tent you can buy a carbon filter. I have a Phresh in my 4x4x7(tall) tent for photosensitives. Wow, it's amazing how well it works with 7-12 plants. My single autoflower is in an unsealed tent. It doesn't smell strong enough to concern me.
If I were in an apartment and concerned, I'd
try OnaGel. A guy at the hydroponics store explained it to me. It's rubbery gelatin bits in a jar. You rehydrate it once a week(?), and rejuvinate it occasionally with some Ona liquid stuff. He said it works really well. Said it's more than just masking odors, but somehow exchanging ions, pulling odors into the released fragrance. For $10-$20, I'd try that for just one plant.
Edit: If you do a 4" or 6" filter, be sure to invest in a "dimmer" like thing to reduce the speed of your inline fan. I bought a 6" Hydrofarm Active Air fan. That thing moves *far* more air than is necessary for my tent. I ended up investing
$55 in a "variac" to control the fan. It's quieter and supposed to not be as much of a strain on the fan's motor like one of
those "dimmer" things. The variac changes the voltage. The dimmer changes the AC current's wave shape, chopping the tops off. Anyway, slowing the fan down will cause the filter to last longer (processing less air). It's just a matter of whether you want to spend $20 or $55. The variac is quiet. I run mine between 45v and 60v. That moves enough air for a 4x4x7 tent. (60v more when the lights are on.).