His strong feeling for personality led him at one time into an obsession with Browning.

It can turn into an obsession if you don't watch out.

The whole Gang falls into an obsession with computer games.

He could understand how the need to see it might grow into an obsession.

What had started as a quest for me was turning into an obsession.

But a dozen or so years ago, I bought a 1959 race car, and since then racing has turned into a major obsession.

By 1955 television had developed from an interesting drug into a vast obsession.

But the idea germinated and slowly grew into an obsession.

All the same, the research project, which along the way had turned into an obsession, could justly be called a success.

But it evolves into an obsession when it's brought to his attention that he can't have her.