Quitting Smoking

Hello mamas! I am 24 and my husband and I just found out we are four weeks pregnant. I've been smoking since I was about 14 off and on. I recently tried to go cold turkey and the side effects were absolutely immense. I had planned on using a prescription but now that we are pregnant that's out. Does anyone have any tips for me? I dont want to endanger the health of my future child as I've seen first hand the damage that can be done while smoking and I think it's rather selfish. I am cutting back now but does anyone have advice for how to do it quickly and safely?

TIA