I used to use tanning beds (well, stand up ones
) for over a year but I gave up a few months back because of the cancer scare. I heard a TV programme had investigated the major companies (in the UK) and found that most of them didn't advise their customers properly on safe levels of tanning. I know the lady who runs the tanning salon I used and I'm sure she wouldn't have endangered me but she did encourage me to get up to 14 minute sessions which is a lot at that intensity (especially for a fair skinned person like me). It did help keep my skin in check. But I think too much UV light really does make the skin more wrinkly. I'm sure my skin is more taught now I'm back to my old white self
I would say that natural sunlight is better for the skin. When I holidayed in Greece last summer my skin looked far better after just one week.