I don't worry about it much unless I'm doing really really old pictures. My Grandfather was a photographer for the Army in WWI and helped build the Panama Canal and finish the Washington Monument. So when I do anything from that era I either copy them or I make sure everything is acid-free. The rest I don't really worry about. But I don't order much from companies other than scrappy ones so I figure most of it is pretty safe.
My kids and grandkids love their scrapbook albums and so does my husband so I'm very blessed in that area. I'm glad too.