Coke is an ultimately addictive drug.....but to get hooked you need to do a fair amount quite frequently.....however the effects of coke ain't 'hard' and are short lived...if one was to do acid as often as one was to do coke...they would become a vegatable....so acid IS harder than coke ..relatively speaking. Heroin is the most hard IMO ...Crack is on par with coke.....but acid is a mind mincer.....you guys might think otherwise ,but i bet you aint done much acid...