You sure are an unlucky person. If you had been born prior to 1973 you could be baptized right away. It wasn't until about 100 years after the religion was founded that they decided smoking was wrong in 1973. Until then you could puff away all you want, in fact, some of their higher ranking officials used to smoke, including Judge Rutherford, their second president, who smoked cigars.
It isn't a very healthy habit though; so it's a good thing to try and quit. I hope you make it!
Tammy