Marijuana and getting pregnant

I've been reading up a bit about trying to fall pregnant while being a smoker and having a partner who smokes. 
I've recently given up weed to increase my chances but my partner is having a bit of trouble as his never given up in his 10 years of smoking. 
He has a child from a previous relationship and he's ex partner only smoked on the odd occasion.
Could it be me? Should I go see my GP ?