I believe at the time I had a mental dependency on it to deal with depression, I felt better every time I did it so in time the connection was made, it was also something that wasn't the easiest to just drop.
As far as socially sanctioned, the fact that we cannot see the lungs or the livers of those drinking and smoking allows one to deny the fact that harm is being done, out of sight out of mind. I didn't do it so much out of a desire to harm myself as to feel better mentally. I've been told by smokers that the relief they get from smoking outweighs the consequences. I felt the same. All 3 of them are harmful to the body, its just the indirect result of the first two that allows people to put the harm they are doing out of mind. Life harms the body true, everyday decisions of pleasure against physical health are made, hence the American McDonalds diet.
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