A26.11 Gaining Control: ... During play, a side gains Control of a Location/hex/building by occupying it with an armed Good Order Infantry MMC without the presence of an armed enemy ground unit [EXC: subterranean units] in that same Location/hex/building (see also 26.13-.14 for hex/building Control).
The usage of the virgule (/ which means and/or) makes this even harder to unpack. It should be properly written as 3 separate sentences. Sure, they would be redundant, but they would be clear.
A26.12 VEHICULAR CONTROL: An armed, non-bypassing vehicle temporarily gains Control of the Location it presently occupies if that Location is devoid of armed enemy units. Control immediately reverts to its prior status (either un-Controlled or enemy-Controlled) if the vehicle leaves the Location. A vehicle which Controls the only Location in a hex also Controls that hex.
Of course, you can control the hex, and the only Location in the Hex, except if it's a building, you don't control the building.
24.8 OUTGOING LOS HINDRANCES: Regardless of the type of SMOKE placed or the method by which it is placed, SMOKE is always more effective in obscuring the view/fire of units inside the SMOKE Location than units outside the SMOKE Location firing into it. Any LOS/non-Residual-fire which is traced out of or within (not through or into) a SMOKE Location must add +1 Hindrance DRM (to its IFT or To Hit DR if a fire attack) in addition to the normal effects of that SMOKE.
So if you're outside the Pillbox, it's +4, but if you're in a Pillbox, it's only +3. Apparently, a Pillbox isn't in the Smoke's Location like you are. -- jim