I just have a menthol after every session to cover the smell, and because it tastes good. The light stimulation and relaxation are also nice over the weed high.

That said, I'm soon going to pick up a bag of good rolling tobaccy from a local tobacconist; it tastes better than cigarettes, and doesn't have all the nasty additives in it. Granted, it has tar and nicotine, but no polonium or ammonia, anyway.