Hookahs are for smoking and hookah bars have been around for eons. It started as a middle eastern thing, but they've gained popularity over the years. You buy flavored tobacco and smoke away. They're kind of fun.
K2 is kind of fun too if you like being RIDICULOUSLY stoned. A while back, my boyfriend and I were curious so we bought some. It looks and smells like potpourri but it gets you seriously high for about a hour and then the sensation completely goes away.