I did some sharp cheddar about 3 weeks ago, used a soldering iron in a can to cold smoke.
Smoked for 1 hr using hickory.
At first it smelled terrible, bitter nasty smell. Thought it would be crap.
2 weeks latter, man it tastes great, I think it could even use more smoke taste to it.
Next time I will try 1.5 hrs or so.