Your charcoal kettle, if doing a roast or ribs, add some chunks of hickory or wood from a fruit tree or a bay tree, close the baffle and let the roast sit in the smoke.
Best time to do this—when the roast has been in the kettle for half an hour or so when the surface of the meat is dry. With hickory I would add some more after the first lot have stopped smoking.
Fruitwood—apricot, peach and plum a nice light smokyness
Hickory—very subtle hence the longer smoking.
Lemon—different smoke flavot
Bay — very good, haven’t used it yet but am trimming the tree and will try this summer.
Rosemary—excellent flavor.
I bought an offset smoker from BBQs Galore, $400. This is the picture from their website (rather plastic looking food!)

Excellent with feral pig ribs!