yes you can, now if it is alight then that right there is an expensive ashtray and and beyond chemical oxidisation increase the ask can and eventualy will get sucked into the parts you just don't want dust and ash. Be that keyboard build up or sucked into intake vents. Then there is the tar buildup from the smoke.<p>So the real question is why would you do that and it will only increase the probability of issues down the line, maybe not right there, but one day.