Authentic opinion by Padmasambava on smoking tobacco
HH Dujom Rinpoche has a teaching about Padmasambava's termas or hidden teachings about Tobacco. There is some info on the web about this. I have the actual teaching made into a book. Here is what it says in breif. Tobacco grew from the corpse of a chinese Demoness about 100 years after Lord Buddhas death. She prophetized that this plant would spread far and wide and poision the virtue of this world system. If you inhale it say bye bye to birth in heaven or authentic spiritaual attainment. It causes irregular seasons and loss of ones Yidam/diety and love bohdichitta mind.
A monk once asked a previous Karmapa why he sometimes smoked but told all the monks thay could not. He brought the monk up in the mountains and inhaled tobacco and then blew out the smoke from his ring finger and said, "once you can do that then you can smoke, a little bit" If you are not authorized by an authentic Lama to overpower the tobacco you will be destroyed by it definitly. Some individuals smoke but do not inhale to divert the evil that happens of those that do inhale. There in that teaching is also statements by the great female yogi Machick Lapdron who said in the future there will be something one puts in the mouth to smoke that will cause the rampid loss of virtue and disturbing emotions to eventually destroy those that smoke. It blocks birth in any heaven of any religion. Some advanced Lamas can chew tobacco if you try before you reach their indistructable state you will be destroyed by it. Trust this.