Absolutely incredible! We were just transferred to Vegas for my husbands job. We found a home that we were interested in buying however the sellers were smokers and we were hesitant to make an offer solely based on the cigarette smell. After doing some research I called Nevada Ozone and spoke to Tom. He explained the process and cost in depth and told me he was 99.99% sure the ozone process would remove the smell. He explained that we may need multiple treatments in order to remove all of the odor. My husband is a former smoker so he is very sensitive to cigarette smell. We decided to put an offer on the house and 6 weeks later we closed escrow. I called Tom and set up an appointment to start the ozone process the day we got the keys. Tom was prompt and professional. He advised that we should wait 5-7 days before deciding if we would need an additional treatment as the smell may return to some degree. When my husband and I entered our new home after the ozone treatment we were nervous, we had just spent a small fortune on a home that could really stink, literally! When we opened the door we were amazed that there was not even a hint of cigarette smell. Our realtor came over and was amazed as well. Our new neighbors came over and were also amazed as this house had been occupied by chain smokers and now literally smelled like fresh mountain air. It's been 10 days and there is still zero cigarette smell. We are more than 100% satisfied and if I could give 10 stars I would!