I'd also suggest you pay attention to any and all legislation including any changes to how the FDA handles CBD oil. Currently as long as the THC level is below .3%, there is almost no regulation on the sale and most of the regulation happens on the domestic grower end of the equation.
I would expect that to change since it isn't tightly monitored or at this point illegal, it is almost like "Natural supplements" where there is no need to prove product quality to sell it. In fact, many of the off-brand oils contain NO CBD oil and as of today, there is little risk to a company putting baby oil in a jar and selling it as CBD and the reason why that is important is because CBD is relatively expensive to manufacture and that just encourages fakes and artificially inflates the supply.
I'm not a trader so do your own research but I think your current stock guy is misleading you because there are obviously manufacturers in the US and honestly if there were a large drug company that owned a larger share of the US production, I would anticipate them to lobby congress for tighter restrictions and control of the market. Long story longer, buy the largest scaled US manufacturer and wait until congress and the FDA acts on their behalf. It almost sounds like you are leaning towards a startup and hoping they survive but IF that market would start to take off, the powers that be in the government will make sure that the regulations are just strict enough so that only the top handful of companies will be able to afford meeting those regulations. In other words, if your stock increases in value in the near future, don't get greedy, just take your profit and GTFO.