Best Answer: Yes cillia regrow after you cease smoking. They are among some of the first things to regenerate to help move toxins in the tissue. 300 Blunts won't damage your lungs.. of course they will and did. Luckily lung tissue is some of the most regenerative.So overall your lungs are likely to regenerate 100% if you completely cease smoking. Yes, in 5 years the lungs will be back to previous levels,..likely before this. You will still run some elevated cancer risk for about 10-15yrs, though it drops off significantly after the first year.o overall your lungs are likely to regenerate 100% if you completely cease smoking. Yes, in 5 years the lungs will be back to previous levels,.. likely before this. You will still run some elevated cancer risk for about 10-15yrs, though it drops off significantly after the first year.