I was just in Indonesia and had the chance to interview a farmer on how he dried and cured his tobacco:
Really simple. 4-days and it's done.
As healthy and natural as it's possible for tobacco to be, I guess.
I've grown my own tobacco off and on over the years. It's hard to find good info on sun-drying methods so I was happy to meet this guy and get a full demonstration. Previously I've pinned whole leaves on strings and hung them out for months and months to dry and cure. I'm going to try this sun-drying method next time I have some growing.