TTC/smoking

Hi everyone! I’ve been TTC with my husband since January and I’m feeling really defeated right now. I’ve had 4 periods, 10 negative tests...I’m starting to wonder if something is wrong with me. I had a really bad miscarriage at 14 and had the paragard iud put in right after and just got it out in January. I’m a healthy eater, exercise, drink water and don’t drink BUT I smoke half a pack of cigarettes a day. Could my stupid addiction to cigarettes be the reason it hasn’t happened yet? Or am I overthinking everything and should I give it more time before I become concerned? 😖