Well, I don't think there's any doubt someone was wildly guessing out of the pathological compulsion you sometimes see to answer when you don't know anything.
The smoke flavor is going to have be get there by applying it directly, the liquid smoke in marinade, or one of the stovetop smokers.
You can buy smoked spices. I have some smoke paprika that's really SMOKED. My grocery had some bulk smoked salt from Mexico that was powerfully smoked, very strong. I don't know this company, but they have a variety of smoked spices, including some smoked grill rub. .
Smoked Spices - Products | Smoke Fine Foods
And King Kooker makes smoked hickory rub, smoked chicken rub, and smoked fish rub. Never used them myself.
Smoking and Grilling Seasonings : King Kooker, Outdoor Cooking Products
As to the indoor smokers, I'll tell you right off, I haven't used one of those. But from what I read in the user reviews, they work and don't stink up the house.
This is a common type:
Camerons Products Stainless Steel Stovetop Smoker: Amazon.com: Kitchen & Dining
There's also a kettle type:
Nordic Ware 365 Indoor/Outdoor Kettle Smoker: Amazon.com: Kitchen & Dining
I don't see any user reviews for the kettle type, but the first type is said to be tight and doesn't leak smoke and doesn't end up with smoke in the house. They are also used by first smoking on the range top and then finishing in the oven. I suspect that give the smoke time to settle some. Most users say it's pretty much what they get on the outdoor grill. I do suspect they had good stove vent systems, though.