<human>: Summarize the given text in a few sentences.

I just recently (Aug. 25th) quit smoking; I would say rather heavily so, a pack or so a day when it was possible financially. I am also a regular coffee drinker, usually averaging 2-3 cups a day. Very rarely do I go to 4. 

I have noticed lately that my ability to process caffeine has dropped *substantially* (jittery and anxious after a cup or two of coffee, to the point of being uncomfortable and feeling minor chest pain), and I have read some preliminary information that would suggest that in the presence of nicotine, caffeine can be much more quickly processed. Is this due to my quitting smoking?

Other stats as requested:
Height/Weight: 5'9" 145 lbs.
Race: White
Existing medical issues: Primary Sclerosing Cholangitis, Ulcerative Colitis
Current meds: Clonazepam, 1 mg. daily for panic attacks
<bot>: why do I suddenly feel like I'm having a heart attack (21 y/o male) after two or sometimes even one cup of coffee now that I've quit smoking?