I'm one of those annoying people that hold to the adage of "seeing is believing".
In this case, it would be "smelling is believing".
My partner used to teach cadaver anatomy @ a medical school. When he came home after teaching, the smell on his clothes caused me to retch, so he had to change clothes before he came home.
I think the jury should be able to smell the cans. The smell has been introduced as evidence. If the jurors are to believe the expert witness testimony, I think they should be allowed to decide for themselves whether or not the smell ios something that would cause them to "jump back".