Man I had this same thing.. that weird curling on one side of the leaf tip is exactly what was happening with mine, and the discoloration. I did some reading and there’s no proof it’s contagious but I swear it spread to another one of my plants, it also got progressively worse on the original plant.. I was in need of room anyhow so I chopped em. But if you don’t have other plants.. grow it out I’d say.
PS I do not smoke tobacco, I believe the name comes from it originally being identified in tobacco plants