[newest_user_]

It's no more difficult, but farming apples is not the same skill set as farming corn. Yes, many skills will transfer but the details need to be worked out. There are many questions that need answers before being successful -- especially on an industrial scale.

[joveian]

One thing Oregon has spent a ton of time dealing with is how to test pesticide levels, THC, and CBD. There are apparently technical issues that make testing difficult and it sounds like it is still needs improvement. Apparently heavy pesticide use is almost universal in growing marijuana and quite a bit remains in the final product. Developing better pesticides would be one thing a national legalization might help with.