The differnce is...from my point of view and I think a good many others....
Someone can sit at a table behind me in a restaurant and mainline heroin and I I won't know... and I won't care.. it's their choice and their problem... nothing to do with me .. unless of course the !!!! sticks his needle into MY arm.
If on the other hand some dirty smelling arsehole 8 tables away lights up ... within 20 seconds I'm having to breath in the evil smelling !!!!!....and THAT is why I get angry.