Crowded see-and-be-seen bars? Been there. Packed dance clubs? Done that. Whimsical, Moroccan-themed lounge with a cigar room, hookahs, and private Sultan’s Tents? Hail us a magic carpet and send us on our way. Charlestown oasis Tangierino (83 Main Street, Charlestown, 617.242.6009) — just unveiled its $1.6 million expansion, and the results are nothing short of opulent. The new lounge, Koullshi, boasts lavish features including the Marrakech Salon (for private dining) and a mahogany bar. And you’ll surely appreciate the state-of-the-art air-purifying system that continuously pulls stale air out and circulates fresh air in, so you won’t even notice that you’re in one of Boston’s few establishments where smoking is not only accepted but encouraged. Unless, of course, you’re too busy ogling the belly dancers.