Believe in Me (1971) [American]

a.k.a.: Speed is of the Essence

Another film in which Jacqueline co-stars with Michael Sarrazin; they had been living together since they met making "The Sweet Ride". Her character, Pamela, becomes addicted to speed. "Speed is of the Essence" was a production (working) title, which was also the title of the article it was based on. I have seen promotional stills with that title.

"Believe in Me" is not available on video, and I've never seen it on TV.

Below is a publicity photo from "Believe in Me"
of Jacqueline with Michael Sarrazin
Another publicity photo:
"before" and "after" becoming an addict. (She has the worst haircut in this movie.)