It's not the ash that smells its the cigar butts, I used to have my in home cigar lounge down stairs. I could just step out the front door when I was done and toss the ashes and butts into the plants. I then had to move my lounge upstairs and inclose the loft. And I did not want to walk down stairs to just dump the ashtray. So at the end of the night I dump it into the toilet and flush, problem solved
