Small bubble or blister under tongue

Yesterday after dinner I noticed a blister type bubble started forming under my tongue. It's on the left side of the middle and at the base. I can touch it with the tip of my tongue which is how I noticed it, it's soft/smooth kind of like a blister and it''s slightly uncomfortable whenever I touch it. First time I ever had it so I'm not sure what it is. Anyone else have such an experience?

Other info:
Been a smoker for 2 year with 2 packs a week
 
Almost any time I have something with fresh tomato I get a small blister in my mouth. As long as it goes away within 5 days or so, it's probably not related to the smoking or anything you should worry much about.
 
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