Best way to get pregant

So me and my husband have been trying for 3 months now to get pregnant we always have sex aleast once everyday im fertile and yet no results. He is 48 and a heavy smoker and I'm 22 could his age be why we can't get pregnant or maybe his smoking idk what to do i want another child. i already have 2 from a previous relationship and neither was planned and i got pregnant reallg easy both times that guy was only in his late twenties. Those happend when i was 18 and 19.