I hope this isn't what you actually believe, as it sounds like an authoritarian nightmare to me! What would happen in your little imagined scenario is that the powers of control would inevitably extend to all undesirable* behaviour and would one-day collapse under its own weight or civil war -- after millions suffered.
* Undesirable being defined by the same nutcases who put this law in to place and could include being homosexual, jewish or having drugs planted on them
Back in the real world, I firmly believe punishment should fit the crime. In the case of taking drugs I can't think why it's a crime and why we would seek punishment! Someone at home getting high doesn't even deserve a trivial fine, let alone having their life ruined.
The only time I see it coming in to play is when mixed with other activties. High controlling machinery or a vechicle? Harsher sentencing. High looking after kids? Child neglect, harsher sentencing. Vandalism or assault... you get the idea.
There will be a negative impact to society where people get hooked on drugs and drop in productivity, but we already have problems with alcoholism, gambling, etc...