I am a light smoker (One an evening mo-fr, but five or six on weekends days)
Then stop. Smoking makes anxiety worse, not better. The relief felt when lighting up isn't a decrease in anxiety levels, but the decrease in withdrawal anxiety overlaid on the background anxiety.
Secondly, as someone who has lost a lung to smoking, it isn't fun. A lobectomy is by far the most painful surgery there is, so painful that the wound is continually irrigated with local anesthetic for 3-4 days on top of the morphine. Yet you'll be grateful for all the pain because surgery is the only chance for a cure. Most don't have that option because their lung cancer is too advanced by the time it's detected. Chemo and radiation can buy a few extra months, but they are rarely curative. Only about 12% of those diagnosed with LC are still alive 5 years later. Far worse odds than playing Russian roulette with all but one chamber loaded!
And don't think you're out of the woods after surgery. Not only may the cancer reoccur with further surgery not being an option, but the loss of lung capacity has ongoing affects on the body, particularly the heart for the lungs act as shock absorbers reducing the back pressure from each contraction. So your heart enlarges which increases the odds of it failing.
I'm gonna put the meds on hold until I can be sure I won't collapse the minute I light a cigarette after my drugs.
The nicotine will only reduce the effectiveness of the propranolol. Propranolol is sometimes prescribed to help smokers quit.