Need help!!

Hi! I'm so happy and excited that I'm 4 weeks pregnant. I have consulted my OB/GYN and she asked me not to smoke or consume alcohol till my delivery. I know it will affect my baby's health but I'm not able to stop smoking. It's something that helps me to stay stable during all my difficult times. Though I know it's not good for health, I'm not able to reduce it's usage or to stop it completely. Many of my relatives are asking me to go to an addiction centre in British Columbia to get rid of my smoking habit. I'm thinking of giving it a shot. I know it will be tough for me but I have to do this for the sake of my baby. I have heard many people will show the withdrawal symptoms which will be scary for nearly 1 month or more. Is it safe for me to go through all these situations at this moment? Will my anxiety affect my baby’s mental health? Thinking about all this is making me go crazy and I feel like to take one puff. I don't think I will be able to quit smoke without anyone's help.