I used to eat watching stuff. Eventually I recognized it as a bad thing. In my case, it distracted me from the food and whatever I was watching. I ultimately dropped this practice and I enjoy my meals way better.

You can see it as a destructive thing, right? Whether it applies to you or not, I wouldn't know.

When I said all habits are self-destructive, I meant that they are conditioning. It's a little part of you that now is in auto mode.

Of course that my example, cigarettes, is also bad for my health. However, the conditioning is mostly chemical (I think), related to nicotine. It was also a way of saying "yeah, I know smoke bad", and a way to make people think of other potential harmful habits (gossip, drugs, promiscuity, stalking, drinking, cheating, etc) and how these things can go hypocritical very fast.