Does your bf's smoking affect your health?

I know this is really random but I'm curious. So ever since I started dating my boyfriend (who smokes) I have been getting regular old canker sores. I only get to see him every 2 weeks and it seems like most of the time we are together I end up getting canker sores (1 or 2 @ a time). Is it possible for the tobacco to affect me when we kiss and cause my canker sores? He doesn't have any sores so I know he isn't passing anything to me, plus canker sores aren't contagious. Has this happened to anyone else?
Does your bf's smoking affect your health?
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