sometimes It helps, sometimes it doesn't. I had a weekend where I was on one helluva losing streak, stopped and took a break, played some normals and some FF 14, and decided ok I'm calmed.. only to run into some of the most toxic and cancerous players that riot refuses to even look at punishing (I'm talking full fledged N word every other line, Intentional feeders that are so obvious even a blind man can see..etc)
so, I ended up not playing league for a few days... it sucks that I had to do that to stop my tilt and to accidentally get punished myself (because the only times I've gotten chat restricted I finally told off the toxic players what I really thought without any filters) , but with the way things are this day and age, you have to.