The common-sense-respecting answer is not to support legislation - that is known to increase a habit that has many negative consequences to individuals and to our society. Pot is something is not needed, corrupts our youth, is a proven health hazard to long term users, and contributes to the degradation of our liberty loving society.
All true of alcohol - as is the case with the negative consequences of prohibition. In a liberty loving society, needs, negative consequences, and health hazards remain an adult's choice (with appropriate consumer warnings). And youth has been reporting since well before any state legalized pot that it was almost as easy for them to get as beer or cigarettes despite the latter being much more widely used among adults; prohibition has failed our youth. Regulated legalization turns the market over to sellers who have an economic incentive to not sell to youth.