Re: Is it possible to have a neck tumor invading spine without neck pain
That doesn't sound very likely... It could be many things according to your symptoms, and one of the most obvious would be a temporomandibular joint (TMJ ) syndrome caused/worsened by anxiety.
Tensions from anxiety & stress take their toll on our neck and shoulders. I used to experience all sorts of pains and weird sensations running from my neck to my arms, shoulders and head.
ps: if being a smoker makes you worried about your health, you really should quit for good, it will help with anxiety in general too (am a former smoker and noticed the difference).
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in doubt consult a doctor...
... and accept to be told you're all fine