There are also caffeinated mints. All the stuff is less than it would be if it were illegal, because of the basic economics of the situation, and not everyone who drinks caffeine winds up popping the pills. Some people want drugs in a hard form, most don't. There can be small shifts, and the market shifts with demand, but there's nothing to support the idea that in all cases people go for the hardest form they can get. The historical experience with alcohol is enough to prove that.
Apples and oranges. There are 2 totally different types of people that consume cocaine, and those that just consume alcohol. Most alcohol users simply want a slight change in mood and feeling. Types that take HARD drugs such as coke, heroin, ect want a SEVERE change in mood and feeling. Those types continually look for more and more to satisfy them.