I think a lot of states are going to follow the progression of legalizing medical marijuana first before pushing for allowing recreational use. Not that it really matters though, even if states want to jump right into recreational use it doesn't mean that there won't be a use for medical marijuana. Medical marijuana gets played up as a way for people to skirt the laws just for recreational use, but there are also a lot of actual people who need it for its medicinal value. Many people who fall into this category aren't going to just start self medicating but will want to get a doctor's opinion and a prescription. A lot of people also aren't necessarily going to want to smoke it, because of the same reasons more and more people don't want to smoke cigarettes; the harm to the lungs, the smell, etc. That's where the products MJNA is producing such as the drops come in.
That being said you also make a good point and it's the same reason I don't have all of my money in just MJNA, but also PHOT, HEMP, CBIS, and am keeping an eye out for new companies that are sure to start entering this sector.
Although, in addition to what I just said earlier about medical marijuana, MJNA seems to have better a better financial standpoint than the rest right now, and that's the reason I have more of my money invested in them.