I"ve been burning now for 7 years and this is the first time I've really noticed that this load seems to smoke more than any other when burning. Could it be it is the oil that I am seeing burn off ?? Heat outpout is fine, stoves burning well, I've just never seen it smoke this much.. No smoke coming out of the chimney, smells a bit more sulfurly (is this a word ? ) Please tell me I'm not nuts or something, is this normal ??