Another vote for 'bombs' - although they are not smoke bombs, they are 'foggers'. They are essentially small aerosols and you just depress the plunger until it clicks, retreat and close the door for 2 hours. Rooms need airing for half an hour afterwards. My daughter tells me that the fashion shops fog the premises every few months for moths and fleas. I fog my house every 6 months, and that has worked very well. You can get packs of 4 from Amazon. I use 6 to do the whole house. The cat also gets monthly Broadline drops on the back of his neck. No problem since.