There were plantations growing coconut, Areca and Betel. The chewing of betel with areca nut was formerly also an important custom. Jackfruit, coconut, palm, areca and plantain trees were also known. Palm-Catechu is extracted from the seeds of "Areca catechu".. Plantation crops like coconut, areca nut, cocoa, cashew nut, and pepper are also grown. The extract of "Areca catechu" may be addictive. The wedding ceremony is called Melah Pinang (Areca nut Splitting). Rice is the main agricultural crop, followed by areca, cashew, and coconut. Hainan has almost 93,000 hectares of areca palms. Chewing areca nut alone has been linked to oral submucosal fibrosis. Current science is confident that areca nut chewing is carcinogenic. The practice of chewing the areca nuts is attributed to Vietnam and Malaysia. Powdered areca nut is used as a constituent in some dentifrices. The main carcinogenic factor is believed to be areca nut. Major SAS/SATA adapter manufacturers are Promise Technologies, Adaptec, HP, QLogic, Areca, LSI and ATTO Technology.