I kicked my habit by installing a host block script in my Tomato router. Just added reddit and HN to blacklisted hosts (I know I can undo it but it's too much work and it disables ad blocking too).

Now anytime I want to visit HN i have to switch to slow 4G and it makes me concious of my decision and slow internet also makes it less fun.

I haven't visited reddit in almost 6 months now (used to refresh it every hour). HN too is 10% compared to what it was before. As other users have commented the reason I still check it 3 4 times a day is because there is often news that relates directly to my business (launch of Google wavenet for example) and benefits me.