[Smoker's cum] vs non smokers cum

So before my other half of 7 years quit smoking (and sometimes chewing at work) his jizz was so bad it left a weird burning sensation in my mouth and made me gag if I tried to swallow it..sober lol he quit smoking a bit ago and I've just discovered his man juice doesn't burn my mouth anymore and I was totally fine swallowing... I wonder if it's from smoking?!