Black smoke. I have a kerosine heater. I stored it for the spring and just started it up 2 weeks

Question

I have a kerosine heater. I stored it for the spring and just started it up 2 weeks ago . I put a new wick in and it worked great. It started smoking real bad. It is a dark black smoke. I can`t figure it out. The only thing I can think of is the fragrant that I put in , It is possible I used to much,