I have read somewhere a while ago. That BTC add ammonia to cigarettes because it helps the body to absorb the nicotine better. I can believe this. the difference between vaping/patch versus smoking is night and day. no matter what you still want an analog when you are on the patch. I was vaping 24mg. strength for the past month. I just made a batch at 18mg. strength and will see how it goes. I am going through a divorce so my stress levels are very high right now and may affect what i need. But life is full of stress anyway.