Hey Doctor, I Am A 22 M Vietnamese And Have

Hey Doctor, I am a 22 M Vietnamese and have been smoking tobacco for a while now 3 years on and off and marijuana 2 years mostly on, sometimes while I'll be smoking an cigarette I gag it feels like my body doesn't want this and it revolts it(I know I should quit) , it happens sometimes and varies. This one time though I had soda drink after a session of marijuana and then I had a cig and I think I gagged so hard, it popped something in my left ear since that incident 2 weeks ago, now I can internal stuff in my left ear, like a rumbling noise every time I swallow, blink hard I hear it and its rather annoying. I've read it could be Eustachian Tube Dysfunction