How to quit smoking

Hi there. Mummies who were smokers before you got pregnant, how did y'all quit smoking during pregnancy? I'm still in my early stages and I find it so hard to just quit smoking. I've gradually decreased my smoking session though (max I'd smoke in a day would be 3 sticks) but I really wanna quit smoking totally. I wouldn't want anything to affect the foetus. Also , I have a toddler turning 2 at home so I don't want to affect his health as well. Although I know that it's all in god's hand if anything were to happen to my foetus , I still feel that I play a part in keeping this pregnancy healthy. Hope to hear some advises on how you guys kept away from smoking. Thanks!!