I dotn smoke weed but am around people who do, is it bad for me to accidentaly inhale some of the secondhand marijuana smoke. its not much.

No evidence of harm: There's strong evidence 2nd hand tobacco smoke is harmful but no clear evidence 2nd hand mar. smoke causes harm. While it does contain toxins, it has many compounds with medicinal benefits, in fact there's evidence small amounts may be good for our lungs! See http://www.scientificamerican.com/article/casual-marijuana-smoking/ Regular use before age 18 lowers IQ so avoid smoking, but this is OK.