Is smoking marijuana less dangerous for you than smoking tobacco?

Both dangerous: Both are dangerous. Marijuana smoke has more carcinogens in it than regular cigarettes do, and people usually inhale and hold the smoke longer with it too. So exposure is very significant -- plus the unspecified additives and possible pesticides that no one really checks for. Alternatively, nicotine is highly addictive, and people usually smoke more regular cigarettes, more often. Neither is good.