Marijuana in Hawaii is legal from mid of 2015 which includes a lot of restrictions. And it is legal only if you have a medical condition and in such cases you can get it legally else Once you start roaming around, you shall be approached by the local who will whisper to you and definitely it means that they are selling pot or if you find someone alone or a small group staring at you, the possibility is he/they are wondering if you want to buy.
Limited licenses for dispensaries (which are just now starting to get issued) and tight restrictions on production and sale make it hard to expect to buy marijuana when you arrive in Hawaii from any kind of “formal” establishment. However, it is common place for locals to be openly selling marijuana in touristy areas around the islands, as marijuana lax is lax and tolerated in Hawaii.
There is no recreational use of pot allowed in the state of Hawaii. Only those residents 21 years of age or older and with a valid medicine card can purchase pot from one of several operating dispensaries. Anything else would be illegal. The penalties range from a simple summons to prison time so it really isn’t worth the inherent risk. Hawaii is a tough-on-crimes state. They have no tolerance policies grossly in affect.