Speaking soley for and as me, I say this...
I view Injecting as borderline cheating. I liken it to steroids in baseball. <dismounts from soapbox>
That being said, one must do what one must to compete and be competetive.
When I do inject it is a mix of butter, honey, dark brown sugar and apple juice. Things your mother wouldn't object to you eating (unless it's my mother, who thought butter was evil
But, injecting is legal, as are pellet poopers, Guru's, etc. so, I find no harm in using what is allowed and available.