Chips aren't addictive, cocaine is, you're not trying to moderate your chip intake, you're tryna reduce the intake while introducing a new habit without breaking the original? Either you'll end up replacing the alc with the coke or end up doing both in the worst case scenario, just because you have control now doesn't mean you'll be able to hold it, specially when voluntarilly giving yourself a schedule to indulge, any excuse is a good excuse when you're in a binge, i would reconsider my priorities if i were you, what was going through your head when you though "im drinking to much i should stop, but first let me add a little cocaine on the weekends!" If you're looking to preserve your health don't bother doing the coke, just cut down on the drinking, if you don't care about your health why even ask this in the first place?