Can someone use drugs, and still be a happy person?

[LesStrat]

Sure, Hannibal. The field you so readily denigrate doesn't use them...only the addicts in denial.

Get back to roasting your neighbor.

[GuitarStv]

The field you so readily denigrate doesn't use them...only the addicts in denial.

Addiction (termed substance dependence by the American Psychiatric Association) is defined as a maladaptive pattern of substance use leading to clinically significant impairment or distress

(Italics added by me.) It sure sounds like addicts and substance users are both used in that field . . .