well the one time I vaped. we just inhaled it. no puffing. it smelled a little bit. but nothing compared to smoke. I am sure if you had a fan it would be IMPOSSIBLE to notice any smell. ours took like 3 min to warm up. although this will certainly vary greatly between models. I think you could expect anything from one min to maybe 6 min. but I dont know. and the one we used was completely silent. no noise whatsoever. hope this helped : )