The "lazy" 7/11 workers would still be the "lazy" 7/11 worker without weed. Weed doesn't inhibit individuals from accomplishing significant feats. Technically there are different strains that have different effects on both the mind and body.
Its non-addictive. Non-dependable. Non-life threatening. -- All the things nicotine and alcohol are not.
Saying it is "stupid" and "childish" makes the one pointing the finger look just that.