They are quite ineffective, unless you spray some kind of cologne with alcohol in it, on the dryer sheets (this absorbs the smell MUCH better.

Ive seen smoke blown through just the sheets, and smelled the smoke that came out, and it was A little covered up, but the good bud we got down here is hard to cover the smell....
RedRainDrop Reviewed by RedRainDrop on . how effective are doob tubes? do they completely emliminate the smell? or will there still be some smell left? Rating: 5