Which is the first Southeast Asian Country to legalise the use of cannabis for medical use?

Which is the first Southeast Asian Country to legalise the use of cannabis for medical use?

طبی استعمال کے لیے بھنگ کے استعمال کو قانونی حیثیت دینے والا پہلا جنوب مشرقی ایشیائی ملک کون سا ہے؟
Explanation

In 2018, Thailand became the first country in the Southeast Asian region to legalise the use of cannabis for medical use.