Quitting smoking

Shelby
I didn't know which category would be good for this.. So I thought this was the closest.
Anyways I've been smoking for three years and me and my partner are quitting today.. I wanted to know what the positives are for quitting to get pregnant? We've been trying and haven't had any luck and read quitting smoking would help.. If we went to vape pens would it still not be good? 
Any advice 
This is gunna be really hard quitting for us and I guess I just need a little support :( 
Thank you