no its not true i have a volcano the best vapourizor there is you till ge a smell but its not really a weed smell an quit faint to
it reminds me a bit of cookies dunno why though
it also depends how much vapour you breath out aswell
if you dont breath any out then there wont be hardly any smell
id say that its a safe bedroom smoke if you live with your rents an need to hide the smell but then youd probably have more trouble hidin the vapourizor especially if its a volcano they are quit big