Hi Matt
Thanks for your questions.
1.It can produce
alot of smoke when it is not up to temperature, however when it is up to temperature it produces very little smoke. My third video (pending number of comments and likes) will demonstrate this.
2.unsure on longevity of box. It is made from low
carbon steel therefore it probably wont last as long as say a stainless steel version!
Any more questions please dont hesitate!
Peace!