Can kissing a heavy smoker adversely affect a non-smoker?

Yes. It can get you more emotionally involved with a person who is going to stink up your life, cost incredible amounts of money, and probably die several years sooner than a non-smoker. You may also end up nursing a cancer patient, or a person with chronic obstructive pulmonary disease, who you will get to watch die slowly and painfully.

Yeah. Their breath might smell like smoke.

The answer above me is a dude who had a smoking wife who took him for all he had. He is mighty bitter.

It was a kiss dude. Not what is you marry a heavy smoker. LOL