This is a stupid idea. Marijuana does not need any form of smart contract technology and what kind of DApps would you possibly create for Marijuana specifically?
Don't waste your BTC people.
Vending machines, delivery services, marijuana medical records as an example DApps. QR marked Marijuana boxes as an example of Marijuana IOT. List of smart contract possibilities is truly endless.
Don't waste your time on them. Ethereum + Marijuana is right in time. Will take some during the ICO