In reply to Chris S.

Chris,

I've been trying to find more concrete information but it looks like some regulations depend on the state and others federal. I know in Nevada, all medicinal marijuana websites must be approved by the state. Here are some articles that will get you started:

http://blog.hubspot.com/marketing/marijuana-marketing

http://www.fastcompany.com/3045240/rebranding-pot/how-to-brand-market-and-sell-weed-without-breaking-the-law

It will be challenging for ecommerce websites as they cannot accept online payments as stated above. You can however sell hemp or products with CBD with online payments.

The last thing for medicinal marijuana is that you cannot make statements that might not be true (e.g. this cures arthritis).

This is definitely a lucrative industry but one that will require caution and considerations for your brand association with it.