Are there any natural treatments or remedies for asthma?

They said the caffeine content of the coffee is effective in relaxing the lungs. Also, some of my friends have proven that ginger is also one of the best remedies for asthma, by chewing it added with salt. Here are some natural remedies for asthma: http://www.top10homeremedies.com/home-remedies/home-remedies-for-asthma.html