If you are looking for a reason not to buy conventional memory foam- well we've got hundreds:
There are over 235 registered complaints about chemical smells, ichy eyes, trouble breathing, etc at Chem-Tox.com
Memory Foam Smell
Why Does It Smell?
For all its advantages, conventional memory foam (not Eco-Friendly) isn't perfect. One of its disadvantages is that when new it does give off a distinctly unpleasant chemical smell. This chemical release is known as off-gassing.Whether or not this is a serious problem depends on the brand of foam you buy and your sensitivity to the smell. Few people are able to sleep with their new memory foam immediately they open it. Personally I had to leave mine airing for about two days and even then I could still smell it slightly for a couple of days more. This seems to be about average. However some people find they need to leave the foam to air for a couple of weeks.
Some are so sensitive to the smell that they simply give up waiting.
If you know that you're sensitive to smells in general then it might make sense to consider buying something small such as a memory foam pillow before investing in a mattress.
Houston, We Have A problem
Apparently it was this smell that kept memory foam "earthbound". Visco-elastic foam was initally designed for the NASA space programme to cushion astronauts from the effects of acceleration and is still often called space foam.
Unfortunately the off-gassing smell was enough to scupper this plan. In a well-aired bedroom, the smell of memory foam might dissipate quickly and become negligible. But in a small cabin with recycled air it would be a distinct problem.
Unlike us, the astronauts could hardly open a window!