my dad's an alcoholic and one of my friends smokes pot a lot (but claims to not be addicted to it despite trying and failing to quit three times. yeah, ok), so if you count that then yes
I know many people that are/were drug addicts including myself and it really is a sad life. An addicted person has so little control over chemicals...
It just grips you and never lets you go
and fyi I'm talking about actual drug addicts not just people that do drugs