I like THCpatch.com better, I'm pretty sure it will be much bigger then any gum.
That said, if you build a site with it. I'm sure it will be worth more, if anyone starts looking for domains like it. I'm sure you are looking for, what it could be worth though.
But the truth is, any RX looking to buy a domain for a drug. Would most likely, want the patch domain. As they would not want to, risk a drug being thought of like a stop smoking gum.
It's just my thoughts on it though, I would build it and get traffic going to it. Then no matter what, you'll get traffic just wanting to find out more that way.