Okay, a bit about lead:
It's pretty dense stuff, and as long as whatever's made of it is intact, presents very little hazard. Unlike paint, which can chip and flak into bitty pieces which can then be inhaled or ingested, the mini-blinds are only going to be a hazard if, as someone suggested a baby might, you chew on them. So unless you tried to eat them for lunch, it's highly unlikely they did you any harm. There are a lot of things that is true for. For example, while I was in the service I worked in a lot of old buildings with asbestos tile on the floor. We were warned to watch for chipping of the tile, but it was considered generally safer to leave intact tile in place than to tear it out, as the work involved in tearing it out was quite hazardous while walking on it was not.
A general rule of thumb is, if someone MIGHT put it in their mouth, or it might shatter and be breathed in, it should be natural and free of dangerous chemicals. Otherwise, it's probably not an immediate threat to health. As for lead, the most important things to make sure are free of it are any old paint around the house (on the walls, furniture, etc.), any really old dishes (some of the funky colors popular in the seventies, for example used lead), and the pipes. (If you've got an older house, the hard-to-get-to pipes could be lead. It tends to last, which was why it was used so much).
breastfeeding, babywearing, homeschooling Heathen parent to my little Wanderer, 7 1/2 , and baby Elf-stone, 3/11!