How do the movies portray Drugs?

Question

and the characters that use them

Has the presentation of drugs changed from from 10-20 years ago

Answer 1

The movies in general?
There is no answer in the broad sense.

Some glorify, others condemn.

Although while the effects of the old propaganda films remain, I think most of todays films leave you to decide fro yourself unlike older films which were meant to influence a person, as opposed to inform them.