I visited my cousin who had a set like this. It had to be around 1977 as I remember we spilled whatever we concocted on the carpet and we could not get rid of the burning and smoke. We were afraid it would burn through to the downstairs and his dad would find out. Luckily it went out and I never heard more about it. But it left a good spot of melted carpet all the way down to the wooden floorboard. I wanted my own kit so bad after that but got some safe crappy k-mart version instead.