Pregnant & scared to starve my baby.

A lot of people might chew me out for this but I don't care. I'm 5 weeks and the only way I can make myself eat is if I smoke marijuana. I only roll in papers so I don't have to use a tobacco leaf (cigars, cigarellos) My mom told she smoke her entire pregnancy with me & I graduated top my class, no problems. I was a heavy smoker before I found out I was pregnant, I'll smoke maybe 5-10 times a day, but now that I know for sure I'm expecting I only cut it down to once a day so I can get me a good meal in. My nausea and mood swings are horrible and that's the only thing that calms that also. I rather smoke so I can eat then starve my baby and be underweight. I read a lot of stuff about it and everything makes me feel like I'm the worst mother ever. I know I'm not the only one out there, any advice? And if your gonna be smart ass, you can keep your comment cause it's not wantedz