Did you use a siphon pump to go with the cigar or were you just using the good old lungs? If you were just using the ol' iron lung, I'd recommend doing another smoke test like in the video below. You get much more flow of much thicker smoke! I burned a cigar down in about 30 seconds and found 3 leaks last week.
https://www.youtube.com/watch?v=rYna4mTVZCE
The guy is annoying but that is the tool you need. I got Pennzoil siphon pump at home depot for $10. Can use it for other tasks around the house / car as well.
https://www.homedepot.com/p/Pennzoil...6677/205092031
How many miles are on your car?