It doesn't have to involve "paper", even fire for that matter. If you're smoking joints, the papers are made out of either rice or hemp. Not wood pulp. You can also have edibles, completely getting rid of the need to inhale. It's also important to note that laws against weed don't prevent impaired driving. In fact it pushes it further under the radar, where it accepts alcohol as a reality and denies the fact there are high drivers right now, and they're doing a lot less damage than the drinkers.