It was movie from 70's or 80's... Plot is in Africa.

What I remember about it is opening scene : African warrior claiming building in NY ( ? ) and using mouth pipe to deliver green smoke inside. Smoke become become a green snake...

Could be some Tarzan movie or Allen Quaterman but I am not able to find anything.

It might be from the beginning of Doc Savage.
Haven't watched it in years, but I seem to recall the green snakes.