I once lost about an 1/8. I was trying to roll a joint and dropped it into aload of wet grass.

I've never lost coke, apart from when i snorted some, and forgot i had and then accused my mate of stealing it.

I smoke a 1/4 skunk a day, so that adds up to nearly 2 ounces a week, and i probs get through about 3 grams of coke a month (I dont take it alot...)