Cannot happen - it may have shifted the dynamic but at worst you are guilty of nothing more than showing a general truth that most of the country is unable and or / unwilling to admit despite them knowing it too - the truth that drugs are a powerful force of nature but a morally neutral concept. As things could still go any direction, I would not panic too much as the chances of him becoming a challenging and somewhat troubled stoner while high, are high in most cases such as this. It takes a real pillock to go from that to a smack problem and even my case, literally sprinting towards the bottom, could have been headed off by someone with your unique life experience.
With regards the tanning stuff tho your girl thinks she has you bang to rights but that is just not the case. I use 1ml's for the most invasive and high risk drug use, nothing more and even then it is only a means to an end - I get no pleasure from the ritual and do not relax until the thing is in the sin bin and the melt takes hold, unlike smoking the drug in which case I love relaxing with a plate. My point is that with regards to sun - tans, anything from a summer heatwave to a month in Crete is the way to sort them shits out. Tans look fuckin' great, but its getting them in the first place that I love, with a beach + John Grisham tome + lager and / or doob. Syringe = tan just feels like crossed wires to me, crossed in the wrong way like as while your reasons for using them should not be encouraged it was at least, on a self serving basis, more than justified.