@rotiya, Ela ela.
@smsanjaya, The only people who call it a 'drug' are people who are either:
1. Uneducated about the facts of ganja
2. Know the facts of ganja, but still have an unjustified hatred towards this wonderful plant
Ganja is a herb. It has been for millions of years and it will continue to be a herb.
As for why it's illegal, refer to the first post.
Also check out this link:
http://www.mannaherbaldoctor.blogspot.com/p/iletter.html
Even buddhist monks accept that ganja was used by the buddha and want it to be legalised.