My friend he is a pack a day smoker.
When they wanted to have children it took them two years later to start testing why they weren't having any luck.

Found out he had really abnormal sperm in fact, they were covered with antibodies. But it wasn't due to him smoking.
His sperm were ruined because his ex grabbed his nuts and cut of circulation for a while.

When they went for IVF, he was told to stop smoking to make his chances of getting his wife pregnant quicker.
He didn't stop smoking and in fact smoked more.
First IVF Pregnant. And she didn't take half her meds whilst doing IVF ( don't ask me how they got pregnant lol)

When his wife was in the TWW, he was worried and rung up his IVF specialist and she said to him "if your sperm were damaged due to something other than smoking that he didn't have to stress"...

Don't know if this is any help to anyone or I am just rambling... but thought it was interesting.


ETA - both my parents were heavy smokers and it took them 2 months to conceive both myself and my older brother...and my dad liked the drink aswell...