Marijuana is the most commonly used illicit drug (19.8 million past-month users) according to the 2013 National Survey on Drug Use and Health (NSDUH). As the nation takes a softer stance on marijuana, more Americans are using the drug. Marijuana use has increased steadily over the past five years. Among the 22 million Americans who need treatment for substance use disorders, only about 2 million - one in 10 - receive it at a specialty facility. Access to marijuana for those needing treatment is still very limited. So, whether you want to grow marijuana for personal or commercial purpose, you...