srk,

There are 12 Step addiction programs/meetings you can participate in.  There are numerous books on how to stop/create a habit.

Substitute a habit for that one.

Install blocking software on your computer.

Note what triggers you to start watching and eliminate them.

Visualize your life without it, i.e. how you would enjoy it and/or how more productive you will be and how good you feel about that.

Have a habit buddy who you can call if you feel the need to watch.

There are many more ways you can find online or in books but that’s a start.

Mark