sorry where did you find out that cannabis is often laced? laced with what? it is "stronger" because of growing techniques and breeding of different plant strains compared to 30 years ago. why would anyone want to lace it with anything? for what purpose?
can i also just add that something being illegal is a stupid argument for not doing something. murder is illegal, is that why you havent killed anyone? because i for one have the moral, ethical and emotional judgement and intelligence to know that killing is wrong, i dont need the law to tell me that. it is illegal to jaywalk in many countries, but we do it here legally. if it became illegal would you suddenly stop because the law says so? the majority would argue no. because you use your judgement and logic to make the decision yourself.
weed can exacerbate underlying mental health conditions (which is why i dont smoke) but so can many other things. lack of sleep, alcohol consumption, stress, trauma, abuse, isolation, bullying amongst other things. it should be up to the individual to decide whether or not to take the risk of worsening mental health. just like it is up to the obese individual to continue without exercise, or healthy eating habits. for every 1 individual who has a mental heath episode, there are thousands whose lives are improved due to cannabis consumption. for chronic pain, depression, anxiety, insomnia, anorexia nervosa, parkinsonism, seizures, IBD, nausea and probably 100s of other conditions.
just because the smell is "offensive" you despise it. there are other means of consumption, which could be more readily explored if decriminalised. i find cigarette smoke disgusting. i cannot stand it. it is responsible for over 6 milliom deaths per year worldwide. but guess what, its ok, because its legal 