"Bought for testing shower fan in bathroom, produces lots of smoke and proved to our plumber that the fan was undersized for the size of the room! Left a smoke smell in bathroom (no surprise there then.........) but cleared after a couple of hours."
"there smoke pellets you set fire to them they make smoke
ideal for check chimney draw
i use a old tin lid to place them on to save the burning it leave not a lot but save messing up carpets ect i also rinse the burning down the sink rather than throwing in bin sometimes there is still a lot of heat left in leavings and better to be safe than sorry .
only down side i found was some times struggle to light if these had a wick i think they would be a lot better