Mild Stimulants

Could mild herbal stimulants such as the coca leaf, khat, kratom or ephedra offer alternatives to the more concentrated substances that now dominate the market? Could the recreational stimulants market be steered towards a less harmful direction over time through differentiating the control mechanisms between plants and synthesized derivatives? Different legal regimes are currently implemented between countries and vary greatly for the different plants, some of which are erroneously considered as new psychoactive substances.