RMH has smoke - help with solar food dehydrator too please

Hello everyone
Hope all are well.
I need help. My rocket mass heater suddenly has smock again. Look at this, why?



Also, I want to present my solar food dehydrator. I learn from Erica's, but hers is so complicated, need to use the electric saw to cut woods, so I alter the idea into use plastic barrel and ducts. However, I don't see the wind come into the barrel. This is the same idea as RMH. Hope you can help me. I put my hand on the top chimny and see no air flow. How do I get air to come into the barrel to dry my food. Please help

Are you burning trash or plastic in the stove?