Is this false memory OCD or something else?

I was asking someone a question and they later mocked me, I continued with my day but then, I had a thought that said: "what if they poisoned my cigarettes"

There are many things that tell me the thoughts aren't real such as:

1)the cigarettes were in my pocket

2)when they mocked me I was walking past them and I never stopped walking

3. there wasn't any physical contact

4. I don't remember anything like this happening

However, I still feel the urge to throw my cigarettes away.

What can I do to try and stop these thoughts happening, previously I would have thoughts where I would imagine scenarios and as irrational as they are, it was difficult to seperate my imagination from reality.

Has anyone dealt with this in the past; if so, what worked for you?