1. You are not going to get high from second hand cannabis smoke unless you're doing mouth to mouth or locked up with 3 other guys smoking in a closet. 2. 30% of daily cannabis smokers have trouble stopping vs 85% of daily tobacco smokers. 3. Smoking indoors uninvited is generally strongly frowned upon in most social settings and prohibited by law in areas open to the public. 4. You don't have to smoke, cannabis is also frequently prepared into "special" cookies or brownies and eaten. The downside is that you then can't have more than one cookie due to the...implications...