Hi G:) Here's the most important part of your post, IMHO:)
You said, "i've been to the doctor and voiced my concerns about lymphoma, but after blood work and multiple check ups, he said i seem to be in great health."
There's not much room for faulty logic to come into play when a Doc says you're in GREAT health!:) He didn't say "OK" health...or maybe you should keep an eye on this or that, etc. Great health is just that...Great health!:) When we have HA, even the most concrete confirmations about our overall health can fall to the wayside when we have an uptick in our anxiety. It's what HA does...and it does it WELL!:)
What do you do for your overall anxiety? What do you practice?
As far as smoking, you don't seem to do it that much in the first place, so why don't you just quit, completely?:) You even asked if your current concern might have something to do with smoking (and drinking). So having HA, and habits that make you think about if they might be detrimental to your overall health, might not be the best combination, IMHO:)
For me, lasting solace has come when I don't rush to the Doc for every new ache and pain and "perceived" change in my body. After I have an "all clear" from the Doc, then there is little reason for my to be seeking reassurances time and time again. But, I do know that this is a major core issue with HA...the need to seek out assurances at a much higher degree than the general population. I do gain some strength from realizing that I would be long gone off this Earth, if my health concerns from the past had come true. I was 100% certain I had a serious heart ailment when I was 21-22 yrs old....I'm now 45:) And still rockin':)
Peace and Feel Well:)